Tip: changing your Amazon password is automatically updated on your Kindle. • To change your Amazon.com password, login to your account.
• On the next screen, scroll down and click "Change Account Settings": • Click the "Edit" button next to your "********" password.
• Enter your current password (security measure), and the new one twice (for confirmation).
• Click "Done".
Caution: the Kindle Fire doesn't include a password-reset mechanism. If you forget your it, the device will offer to reset its data to factory settings after four failed attempts.