To install the app onto your iPhone / iPad / iPod Touch from iTunes:
1. Open iTunes and go to the Apps area in your Library.
Note: If Apps is not available in Library, add it by going to Edit > Preferences and check off Apps under Sources.
2. Drag the .ipa file from your computer into your iTunes Apps window. A new icon with your app name should appear in Apps as shown below.
3. Connect your iPhone/iPad/iPod Touch to your computer via USB cable and select Device > <your device> > Apps. Make sure your app will sync by either checking it off or dragging it from the list of apps to the preview.
4. Hit Sync (or Apply) to sync your iPhone/iPad/iPod Touch/ to iTunes.