Visit https://author.amazon.com/ to sign up for Amazon Central.
Sign up with your KDP account to streamline linking your books between KDP and Author Central.
If you already had an Author Central page set up before publishing via KDP, your books may not automatically appear on your page. If this is the case, search for and add them manually.
Once signed in, you can search for your books by title, author name or ISBN. After locating your book, Amazon will send a confirmation email to you (or your publisher, if it was not published through KDP) to verify ownership. Once approved, it may take a few days for the book to appear on your Author Central page.