How To: Scene Change After Facebook Login?

After Device Authentication and initializing with Gamesparks through the Splash Screen, my next scene has Facebook Login and Custom Login. I managed to make login through Facebook work but I have no idea how to implement a scene change upon completion. I tried using SceneManager.LoadLevel ( ) but I don't know how to tie it in to only activate after Facebook Login is successful. Just leaving it as is changes the scene even if I hit "Send Cancel" when asked for the Facebook Token.

So my question is, is it possible to trigger a scene change after the script successfully completes?

Here is the code for my Facebook Login:

 using UnityEngine;
 using UnityEngine.UI;
 using System.Collections;
 using System.Collections.Generic;
 using System;
 using GameSparks.Core;
 using GameSparks.Api;
 using GameSparks.Api.Responses;
 using GameSparks.Api.Requests;
 using Facebook;
 using Facebook.Unity;
 
 
 public class FacebookScript : MonoBehaviour
 {
 
 
 
     void Awake()
     {
         FB.Init(SetInit, OnHideUnity);
     }
 
     void SetInit()
     {
 
         if (FB.IsLoggedIn)
         {  GSFacebookLogin(AfterFBLogin);
             Debug.Log("FB is logged in");
         }
         
         else
         {
             Debug.Log("FB is not logged in");
         }
 
     }
 
     void OnHideUnity(bool isGameShown)
     {
 
         if (!isGameShown)
         {
             Time.timeScale = 0;
         }
         else
         {
             Time.timeScale = 1;
         }
 
     }
 
     public void FBlogin()
     {
 
         List<string> permissions = new List<string>();
         permissions.Add("public_profile");
         permissions.Add("user_friends");
 
         FB.LogInWithReadPermissions(permissions, AuthCallBack);
     }
 
     void AuthCallBack(IResult result)
     {
 
         if (result.Error != null)
         {
             Debug.Log(result.Error);
         }
         else
         {
             if (FB.IsLoggedIn)
             {
                 Debug.Log("FB is logged in");
             }
             else
             {
                 Debug.Log("FB is not logged in");
             }
         }
 
     }
     void GameSparksFBConnect(ILoginResult result)
     {
 
         if (FB.IsLoggedIn)
         {
             Debug.Log("Logging into gamesparks with facebook details");
             GSFacebookLogin(AfterFBLogin);
         }
         else
         {
             Debug.Log("Something wrong  with FB");
         }
     }
 
     //this is the callback that happens when gamesparks has been connected with FB
     private void AfterFBLogin(GameSparks.Api.Responses.AuthenticationResponse _resp)
     {
         Debug.Log(_resp.DisplayName);
     }
 
     //delegate for asynchronous callbacks
     public delegate void FacebookLoginCallback(AuthenticationResponse _resp);
 
 
     //This method will connect GS with FB
     public void GSFacebookLogin(FacebookLoginCallback _fbLoginCallback)
     {
         Debug.Log("");
 
         new GameSparks.Api.Requests.FacebookConnectRequest()
             .SetAccessToken(AccessToken.CurrentAccessToken.TokenString)
             .Send((response) =>
             {
                 if (!response.HasErrors)
                 {
                     Debug.Log("Logged into gamesparks with facebook");
                     _fbLoginCallback(response);
                 }
                 else
                 {
                     Debug.Log("Error Logging into facebook");
                 }
 
             });
     }
 
     
 }