LoadOnClick Script doesnt appear in a Canvas Function

I'm trying to create a menu and I'm following the tutorials. Problem is, I created the script but I can't use it as a function in the OnClick section. There should be a new function called LoadOnClick with my script but It's not there.

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 
 public class LoadOnClick : MonoBehaviour {
 
     public void LoadScene(int level)
     {
         Application.LoadLevel(level);
     }
 }

Here's an image that show my problem: