error CS0120: An object reference is required to access non-static member `UnityEngine.UI.Toggle.isOn'

Hi, I'm having this error: error CS0120: An object reference is required to access non-static member `UnityEngine.UI.Toggle.isOn' And here's the code.

 using UnityEngine;
 using UnityEngine.UI;
 using MaterialUI;
 using System.Collections;
 using System.Collections.Generic;
 
 
 public class Manager : MonoBehaviour {
 
     [SerializeField]
     private Image m_ColorImage1;
     [SerializeField]
     private AnimationCurve m_AnimCurve;
     private string currentLevel = "";
 
     public Text scoreText;
     public bool isOn; 
     public float score;
     public void Link(string url) { Application.OpenURL(url); }
 
     void Start(){
         score = 0;
         SetScoreText ();
         scoreText.text = "0";
     }
     public void LoadScene(string scene)
     {
         Application.LoadLevel(scene);
     }
 
     void SetScoreText(){
 
         scoreText.text = score.ToString();
     }
     public void ToggleAddScore(string num){
         if (Toggle.isOn = true){
             score += 1;
             SetScoreText();
         }
         Toggle.isOn = false;
     }
 
     public void QuitApp()
     {
 #if UNITY_EDITOR
         UnityEditor.EditorApplication.isPlaying = false;
 #else
         Application.Quit();
 #endif
     }
 }

I searched alot, but not worked..