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Multiple accounts can be created if you mistakenly indicate you're a new customer when signing in. If you're signed into one account, you won't be able to view or edit in the other account, and Your Bookshelf will appear empty.
Just log out of the current account by clicking on the "Sign Out" link at the top right corner, and log back in to the KDP web site at https://kdp.amazon.com with the appropriate e-mail and password combination. If you've forgotten the password for your KDP account, click the "Contact Us" button on this page to let us know. We'll reset your password for the correct account.
If you have only one account and wish to reset the password yourself, you may do so here.