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Hello You cannot change your payment details directly on the Kindle (Amazon has changed that). You must go on a PC and log onto www.amazon.com and follow the steps below:
Amazon Device Support › Managing Your Fire & Kindle, Kindle Content, and Account›
Manage Your Kindle Payment Settings
You can view or edit your 1-Click payment method by visiting the Settings page within Manage Your Content and Devices.
To view or edit your 1-Click payment method:
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