hello to you, would you help me this problem, now I'm writing application software using xcode ios me to advertise chartboost on my application. file AppDelegate.m 1. Code: [ChartbooststartWithAppId:mad:"my-id"appSignature:mad:"my-id"delegate:self]; [ChartboostcacheRewardedVideo:CBLocationMainMenu]; [ChartboostcacheMoreApps:CBLocationHomeScreen]; 2. Code: [ChartboostshowInterstitial:CBLocationHomeScreen]; [ChartboostshowRewardedVideo:CBLocationMainMenu]; now I want 15 seconds is automatically changed ad on my app first time, you do know can help me. we're looking for help.