The thing with Author Central is that you have to set up a site on each of their sites…aka USA, UK, Canada…
on Nonfiction Authors Association:
Amazon’s Author Central is an essential tool for managing your books and author information on the site.
Every author should take full advantage of the free service because it allows you to update content on your book page, keep author bio information up to date, see your sales data, and more.
Both print and Kindle-only authors can utilize Author Central.
Following are some of the benefits, and how to best utilize them.