I need help with my Kindle!?

Okay, so i want to use my gift card to buy books on my Kindle. Only gift cards. When I tried it kept saying I don't have a valid default credit card specified for my amazon.com use account. I dont want them to bill anything to a credit card. So i went to amazon.com and tried there, and it told me I had to put a... show more Okay, so i want to use my gift card to buy books on my Kindle. Only gift cards. When I tried it kept saying I don't have a valid default credit card specified for my amazon.com use account. I dont want them to bill anything to a credit card. So i went to amazon.com and tried there, and it told me I had to put a billing address down. So I did. And the gift card is all redeemed. I have $25 on my account, and I STILL can't download any books! HELP ME!!
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