On their author page, I read their bio, see links to their websites, and see a list of books they, and only they, have written. I then scroll through them to choose one I want to buy.
See how this is a great marketing tool to the people who are interested in learning more. That is also why you need to write more than one or two books. You need to give your potential readers choices.
So, how do you get an amazon author page? Go to Amazon Author Central. You can sign up there and link your books to it. Fill out as much info as you can and keep it updated.