The app uses the same purchasing system as our website. To buy a game from the app, just click the Buy button next to the game. This will take you to your shopping cart, and you can check out just like you would on the website, including using Big Fish Points on a purchase.
If you have a coupon code, you can enter it in the Have a coupon code? box, then click Apply.
Please note that games you add to your cart on the website will not appear in your cart in the app.