Currently Being ModeratedFeb 4, 2012 1:31 AM (in response to Headroll)
Click Account under Quick Links right side of the App Store window.
In the Account Information window click the Edit button to the right of Payment Type.
Enter the new credit card number, expiration date, security code then click Done.
If you have problems, read here > iTunes Store: My credit card's security code or zip code does not match my bank's records
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