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Hello,To change any CC information, you need to update your Amazon "One Click Payments" credit or debit card info from a PC (not from the Kindle) at the link below:
http://www.amazon.com/gp/help/customer/display.html?nodeId=201252570If you need further assistance let me know. Please do not forget to click the 5 STAR RATING, at the top of the page for my efforts. It is my livelihood and you can follow up at any time if needed.