To use an iTunes promotional code, follow these steps:

  1. Launch the App Store app on your iPhone/iPad/Mac
  2. Tap on the Featured tab in the bottom navigation if you aren’t there already
  3. Scroll all the way down to the bottom of the Featured page
  4. Tap on the Redeem button
  5. You may be asked to sign into your iTunes ID, do that now
  6. Enter your code: