Pressing the enter key to chat script writing TextField How can I activate?

Pressing enter my chat script to write TextField How can I activate?

DontDestroyOnLoad(this);

 var          mySkin : GUISkin;
 private var     gameNameType = "UnityChat"; // leave this alone. then we will see all other builds of this example
 var          myGameName : String = "thylaxene's Chat";
 var          gameDesc : String = "Very Basic Chat App";
 var          userName : String;
 private var     timeoutHostList = 0.0;
 private var     lastHostListRequest = -1000.0;
 private var     hostListRefreshTimeout = 10.0;
  
 public var      serverPort = 25002;
 private var     natCapable : ConnectionTesterStatus;
 private var     filterNATHosts = false;
 private var     doneProbingPublicIP = false;
 private var     hideTest = true;
  
 private var     windowRect = Rect (-110,40,100,50);
 private var     windowRectT = Rect (100,290,200,300);
 var          scrollViewVector : Vector2;
  
 private var     outputText : String = "";
 private var     yourInputText : String = "";
  
 // Enable this if not running a client on the server machine
 //MasterServer.dedicatedServer = true;
  
 function OnFailedToConnectToMasterServer(info: NetworkConnectionError) {
     Debug.Log(info);
 }
  
 function OnFailedToConnect(info: NetworkConnectionError) {
     Debug.Log(info);
 }
  
 function OnDisconnectedFromServer (info: NetworkDisconnection) {
     Debug.Log(info);
 }
  
 function OnServerInitialized () {
     networkView.RPC ("SendMessage", RPCMode.AllBuffered,  (userName + " Baglandi"));
 }
  
 function OnConnectedToServer () {
     networkView.RPC ("SendMessage", RPCMode.All,  (userName + " Baglandi"));
 }
  
 function OnGUI () {
     GUI.skin = mySkin;
     windowRect = GUILayout.Window (0, windowRect, MakeWindow, "Giris Kontrolu");
     windowRectT = GUILayout.Window (1, windowRectT, MakeTranscriptWindow, "Chat Alani");
 }
  
 function Awake () {
     // Start connection test
     natCapable = Network.TestConnection();
  
     // What kind of IP does this machine have? TestConnection also indicates this in the
     // test results
     if (Network.HavePublicAddress())
        Debug.Log("This machine has a public IP address");
     else
        Debug.Log("This machine has a private IP address");
 }
  
 function MakeTranscriptWindow () {
     GUILayout.Label ("Mesajlar:");
     scrollViewVector = GUILayout.BeginScrollView (scrollViewVector);
        GUILayout.TextArea (outputText);
     GUILayout.EndScrollView();
     GUILayout.Label("Mesajin: "); 
     yourInputText = GUILayout.TextField (yourInputText);
     if (GUILayout.Button ("Gonder")) {
        networkView.RPC ("SendMessage", RPCMode.All,  yourInputText);
        yourInputText = "";
     }
  
     GUI.DragWindow (Rect (0,0,1000,1000));
 }
  
 // this is where the magic is. when this function is called via networkView.RPC
 // everyone's chat log is updated
 @RPC
 function SendMessage (text : String) { 
     outputText += (text + "\n"); 
 }
  
 function Update() {
     if(Input.GetKeyDown(KeyCode.Escape))
      mert = !SendMessage;
  
     if(Input.GetKeyDown(KeyCode.Return))
    networkView.RPC ("SendMessage", RPCMode.All,  yourInputText);
  
 }
  
 function MakeWindow (id : int) {
     GUILayout.BeginHorizontal ();
        GUILayout.Label ("Adiniz:");
        userName = GUILayout.TextField (userName);
     GUILayout.EndHorizontal ();
  
     hideTest = GUILayout.Toggle(hideTest, "Ellesme");
  
     if (!hideTest) {
        // Start/Poll the connection test, report the results in a label and react to the results accordingly
        natCapable = Network.TestConnection();
        if (natCapable == -2)
          GUILayout.Label("Problem determining NAT capabilities");
        else if (natCapable == -1)
          GUILayout.Label("Undetermined NAT capabilities");
        else if (natCapable == 0) {
          GUILayout.Label("Cannot do NAT punchthrough, filtering NAT enabled hosts for client connections, impossible to run a server.");
          filterNATHosts = true;
          Network.useNat = false;
        }
        else if (natCapable == 1) {
          if (doneProbingPublicIP)
           GUILayout.Label("Non-connectable public IP address (port "+ serverPort +" blocked), NAT punchthrough can circumvent the firewall.");
          else
           GUILayout.Label("NAT punchthrough capable. Enabling NAT punchthrough functionality.");
  
          // NAT functionality is enabled in case a server is started, clients enable this based on if the host requires it
          Network.useNat = true;
        } else if (natCapable == 2) {
          GUILayout.Label("Directly connectable public IP address.");
          Network.useNat = false;
        } else if (natCapable == 3) {
          GUILayout.Label("Non-connectble public IP address (port " + serverPort +" blocked), running a server is impossible.");
          Network.useNat = false;
          if (!doneProbingPublicIP) {
           natCapable = Network.TestConnectionNAT();
           doneProbingPublicIP = true;
          }
        }
        else if (natCapable == 4) {
          GUILayout.Label("Public IP address but server not initialized, it must be started to check server accessibility.");
          Network.useNat = false;
        }
  
        if (GUILayout.Button ("Retest connection")) {
          Debug.Log("Redoing connection test");
          doneProbingPublicIP = false;
          natCapable = Network.TestConnection(true);
        }
     }
  
     if (Network.peerType == NetworkPeerType.Disconnected) {
        GUILayout.BeginHorizontal();
        GUILayout.Space(10);
        // Start a new server
        if (GUILayout.Button ("Chat'e Baglan")) {
          Network.InitializeServer(32, serverPort);
          MasterServer.RegisterHost(gameNameType, myGameName, gameDesc);
        }
  
        // Refresh hosts
  
  
        GUILayout.FlexibleSpace();
  
        GUILayout.EndHorizontal();
  
        GUILayout.Space(5);
  
        var data : HostData[] = MasterServer.PollHostList();
        for (var element in data) {
          GUILayout.BeginHorizontal();
  
          // Do not display NAT enabled games if we cannot do NAT punchthrough
          if ( !(filterNATHosts && element.useNat) ) {
           var name = element.gameName + " " + element.connectedPlayers + " / " + element.playerLimit;
           GUILayout.Label(name);  
           GUILayout.Space(5);
           var hostInfo;
           hostInfo = "[";
           for (var host in element.ip) {
               hostInfo = hostInfo + host + ":" + element.port + " ";
           }
           hostInfo = hostInfo + "]";
           //GUILayout.Label("[" + element.ip + ":" + element.port + "]"); 
           GUILayout.Label(hostInfo);  
           GUILayout.Space(5);
           GUILayout.Label(element.comment);
           GUILayout.Space(5);
           GUILayout.FlexibleSpace();
           if (GUILayout.Button("Giris Yap")) {
               // Enable NAT functionality based on what the hosts if configured to do
               Network.useNat = element.useNat;
               if (Network.useNat)
                  print("Using Nat punchthrough to connect");
               else
                  print("Connecting directly to host");
               Network.Connect(element.ip, element.port);        
           }
          }
          GUILayout.EndHorizontal();   
        }
     } else {
  
        GUILayout.FlexibleSpace();
     }
     GUI.DragWindow (Rect (0,0,1000,1000));
 }