You can prevent accidental purchases that some apps and games offer as you use them on your Fire tablet. In-app purchasing options typically offer some additional functionality for the app or game you are using. For example, a game might offer you the opportunity to purchase in-game currency or new game levels, or it might prompt you to purchase subscriptions.
Because the additional functionality you are offered will cost money, you can prevent in-app purchasing by changing Amazon Appstore for Android settings.
Swipe down from the top of the Fire tablet.
The Quick Settings screen appears.
Tap Settings (2). The Settings screen appears.
Tap Applications (3). The settings screen for Applications appears.
Tap Appstore.
The App Settings screen appears.
Tap In-App Purchasing.
The In-App Purchasing settings screen appears.
Tap Allow In-App Purchases.
The Password Required box appears.
Type your Amazon account password (7). Tap Continue (8).
You can tap the Back arrow (A) to back up one level in Settings or the Home button to return to the Fire tablet Home screen.