Kk I wanna know how to use the iTunes card when purchasing something on my ipad2 ,without having it charge on the credit card by accident? Plz help?,!
Like does it ask u if u want to use the gift card or what??????

Open your iTunes application. Then redeem your gift card. There will be a credit from that on your account. Anything you purchase will come out of that account balance, before they start charging your credit card.

You can also open an iTunes account with a gift card, and avoid linking your credit card altogether.