title: adding Interstitial into chartboost
body: <p>so after a week of attempting to load chart boost to my non-arc iOS app in Xcode, I'm gonna start asking some really silly questions.
  my code in my appdelegate is: </p>
  
  <pre><code>(void)applicationDidBecomeActive:(UIApplication *)application {
      [[CCDirector sharedDirector] resume];
      Chartboost *cb = [Chartboost sharedChartboost];
  
      cb.appId = @"530dd707f8975c182ae2c691";
      cb.appSignature = @"0d8726e69c911a182b0cefac4eca36f692355725";
  
      // Required for use of delegate methods. See "Advanced Topics" section below.
      cb.delegate = self;
  
      // Begin a user session. Must not be dependent on user actions or any prior network requests.
      // Must be called every time your app becomes active.
      [cb startSession];
      [cb showMoreApps];
      [cb cacheInterstitial:@"Play Again"];
      [cb showInterstitial:@"Play Again"];
      // Show an interstitial
      [cb cacheInterstitial:@"Highscores"];
      [cb showInterstitial:@"Highscores"];
  </code></pre>
  
  <p>when i start the app, yea i get the test ad appear so thats all good, but  i cannot get it to show apps throughout the game or get these interstitials working at all.</p>
  
  <p>so my first question: will the random ad's appear throughout the app(but only when the game is uploaded to the app store and not through test mode)</p>
  
  <p>and secondly, can someone please explain with this showInterstitial locations. I've read many many documentations, even looked through the examples on chart boost, which they only link to buttons rather than to, for example, when i die in the game and then i want an ad to appear.
  so can someone explain on here how to implement these interstitial appearance, as my "play again" and "highscores" seem to do nothing(and yes I've added a campaign logic but still, no ad is showing when the player dies and the screen goes to the high score page</p>