where do i place this leadbolt code?

ok i can not seem to place this code anywhere with out errors can anyone help.

This is what the leadbolt website tells me but where do i put the code?

"Add the following single section of code to your app’s main script file to integrate an AppFireworks module on entry (Location: welcome), a Leadbolt interstitial ad (loaded if the AppFireworks module/location is disabled and fails to load) and an audio ad. Analytics data will also be gathered"

 void Start()
 {
     // Initialize Ad serving + AppFireworks
     // LeadboltController.setLandscapeMode ("1"); // un-comment for Landscape mode
     LeadboltController.createAdWithSectionId ("YOUR_LB_AUDIO_ID");
     LeadboltController.loadAudioAd();
 
     // AppTracker.setLandscapeMode (true); // un-comment for Landscape mode
     AppTracker.onModuleFailedEvent += onModuleFailedEvent;
     AppTracker.startSession("APPFIREWORKS_API_KEY");
 }
 
 void onModuleFailedEvent()
 {
     loadDisplayAd();
 }
 
 void loadDisplayAd()
 {
     // Use this function elsewhere in your App to display a Leadbolt interstitial Ad
     LeadboltController.createAdWithSectionId ("YOUR_LB_INTERSTITIAL_ID");
     // LeadboltController.loadAdToCache(); // Un-comment and place appropriately to cache Ad
     LeadboltController.loadAd();
 }