Help calling a code in C# script

Bare with me here as i'm a beginner at using C# im not familiar with it cause i mainly use Javascript. I'm using C# cause in order for this plug-in to work it needs to be in a C# script. But anyway on to the main question! So i want to call this code

 CBBinding.showInterstitial(null);

into my Menu script

 using UnityEngine;
 using System.Collections;
 using Chartboost;
 
 public class Menu2 : MonoBehaviour {
 
 
         private Ray ray;
         private RaycastHit rayCastHit;
 
 
         void Update ()
         {
             
             if(Input.GetMouseButtonDown(0))
             {
                 ray = Camera.main.ScreenPointToRay(Input.mousePosition);
 
                 if(Physics.Raycast(ray, out rayCastHit))
                 {
                     if (rayCastHit.transform.name == "PlayButton")
                     {
                         Application.LoadLevel("Main Game");
                     }
                 }
             }
         }
 
     }
 

Like i said before im a beginner at C# , i know i have to make a class for it in order to call it but the documentation for it doesnt really explain it well on where to call it! I was hoping if the Unity community could help me out, so in the future i won't have this problem again! here is a link to the documenatation of the plug-in Documentation If you could help thank you! EDIT: I did try to my best to implent it but i kept getting errors sigh