How to hide the cursor

hello I have made a menu in unity and need to implement this code into it void Start () { Screen.showCursor = false; }

I need to put it in this:

 void Start ()
 {
     Screen.showCursor = false;
 }
 using UnityEngine;
 using System.Collections;
 
 public class pause$$anonymous$$enu : $$anonymous$$onoBehaviour 
 {
     public GUISkin myskin;
 
     private Rect windowRect;
     private bool paused = false , waited = true;
 
     private void Start()
     {
         windowRect = new Rect(Screen.width / 2 - 100, Screen.height / 2 - 100, 200, 200);
     }
 
     private void waiting()
     {
         waited = true;
     }
 
     private void Update()
     {
         if (waited)
             if (Input.Get$$anonymous$$ey($$anonymous$$eyCode.Escape) || Input.Get$$anonymous$$ey($$anonymous$$eyCode.P))
             {
                 if (paused)
                     paused = false;
                 else
                     paused = true;
 
                 waited = false;
                 Invoke("waiting",0.3f);
             }
     }
 
     private void OnGUI()
     {
         if (paused)
             windowRect = GUI.Window(0, windowRect, windowFunc, "Pause $$anonymous$$enu");
     }
 
     private void windowFunc(int id)
     {
         if (GUILayout.Button("Resume"))
         {
             paused = false;
         }
         if (GUILayout.Button("Options"))
         {
 
         }
         if (GUILayout.Button("Quit"))
         {
 
         }
     }
 }
 

@Spy4812 please don't post a new question as a comment or answer.