Follow these steps to disable in-app purchases from your device:
  1. From your home screen, tap on the “Settings” app button
  2. Select the “General” category in the Settings menu
  3. Scroll down to the “Restrictions” category in the “General” menu
  4. Tap the “Enable Restrictions” button
  5. If this is your first time enabling restrictions you may be asked to set a Restrictions Passcode.  You will need to create and enter a four digit passcode (enter it twice to set it).
  6. Once the passcode is set, scroll down to the “In-App Purchases” setting.  Slide the button to “Off” to disable In-App Purchases.