Here's where you'll find the buttons. This is my author's page, in case you're wondering.
If you have a Twitter or Facebook account, click those buttons, too. This posts the author's page on your Facebook feed and tweets it. Not only does this give the author a bit of exposure and let the world know you enjoy his or her books. It also creates backlinks, which further increase the author's search ranking.
Happy clicking. And if you'd like to start with mine, I'd appreciate it. (*tuneless whistle*)