How to add a Control Page to Pause Menu?

So the problem I have is the control button I have will not open up the controls page I have. The code runs when I test it but nothing happens on screen so I know it's executing but not why it won't run. Its suppose to have a button to open the instructions and another to go back to the pause menu. I'm fairly new to this.

using UnityEngine; using UnityEngine.UI; using System.Collections;

public class PauseMenu : MonoBehaviour {

 public GameObject PauseUI;
 private bool paused = false;
 public GameObject Controls;
     //public Button backText;    
     //public Button InstructionsText;


 void start ()
 {
     PauseUI.SetActive (false);
     Controls.SetActive (false);
     //Controls.enabled = false;
     //Controls = Controls.GetComponent<Canvas> ();
     //backText = backText.GetComponent<Button> ();
     //InstructionsText = InstructionsText.GetComponent<Button> ();

 }

 // Used to see if the game is paused and whether or not the pause screen shows 
 void Update () 
 {
     if (Input.GetButtonDown ("Pause")) 
     {
         paused = !paused;
     }
     //will pause the game
         if (paused)
         {
             PauseUI.SetActive(true);
             Controls.SetActive(false);
             //Controls.enabled = false;
             Time.timeScale = 0;
         }
     
     //will not pause the game    
     if (!paused)
             {
             PauseUI.SetActive(false);
             Controls.SetActive(false);
             //Controls.enabled = false;
             Time.timeScale = 1;
             }
     
     }

 //resumes the game
 public void Resume()
 {
     paused = false;
 }

 //takes you back to the main menu
 public void Exit()
 {
     Application.LoadLevel (0);
 }

 //suppose to bring up the controls
 public void Instructions()
 {
     PauseUI.SetActive (false);
     Controls.SetActive (true);
     //Controls.enabled = true;
     Debug.Log ("running");
 }

 //suppose to take you back to the pause menu
 public void Back()
 {
     Debug.Log ("Back");
     PauseUI.SetActive(true);
     Controls.SetActive(false);
     //Controls.enabled = false;
 }

}