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To change any of your CC information, you need to update your Amazon "One Click Payments" credit or debit card info from a PC or Laptop (NOTE: This can not be done from the Kindle directly).
You can view more information on how to to this from the link below:
If you need further assistance let me know. Before you go, PLEASE DO click at least a 3 STAR RATING, at the top of your screen. That is how I am credited for my efforts by the site. You can follow up any time as needed at no additional cost.