How to remove credit card option to ';none'; with iTunes account?

i created my iTunes account with a 50$ Gift card credit card. But now there is only 3.85$ left, and i want to stop using it. I want to use no credit cards anymore. Is there a way to change that?

10 points for BEST ANSWER!How to remove credit card option to ';none'; with iTunes account?
You go to the payment options, go under what says what kind of card, and I think it either says gift card or none.How to remove credit card option to ';none'; with iTunes account?
Leave the credit card on there, because it will not let you get ANYTHING, even free stuff without one.

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