To redeem a code on your iPhone:

  1. In the App Store, tap your iTunes account icon in the top right corner
  1. Tap on Redeem Gift Card or Code link
  1. Tap Enter Code on the new sheet that appears
  1. Enter in the promo code
  2. The App Store will ask you to enter your iTunes password (at least it should)
  3. On success message – login into the Zero to 5k app – if full access isn’t granted upon opening the app, simply open the in-app purchase page and tap on “Restore Purchase” and the app will update with full access