Main menu not working

Hey, I have been taking help from a tutorial site how to make a menu. I made a new scene that shall function as a menu and added a script to the camera that would supposedly make a menu. But nothing pops up when I start the game!

here's the script:

using UnityEngine; using System.Collections;

public class Menu : MonoBehaviour {

 #region Fields
 
     private string instructionText = "Instructions: \n Move around with the arrow keys, when you think you have found that speciall place \n in life...press space";
     private int buttonWidth = 200;
     private int buttonHeight = 50;
 
 #endregion
 
     
 // Use this for initialization
 //void Start () {
 
 //}
 
 // Update is called once per frame
 //void Update () {
 
 //}
 
 #region Functions
 
 
 void OnGui ()
 {
     GUI.Label(new Rect(10,10,200,200), instructionText);
     GUI.Button(new Rect(Screen.width / 2 - buttonWidth / 2, 200,buttonWidth, buttonHeight), "Start game");
         
     
 }
 
 #endregion