On every Book detail page (click on the book title to access), there is a tab called Bookshelves. Every member who owns that book is listed. Click on a username and you can see that member's Profile page and a list of the books they own. There is an option to see books you have in common or just the books that are indexed. If you want to see the book covers and more detail, use the Collapse/Expand toggle.
If you want to see your own Profile page click on your username in the top right hand corner and select Profile. To edit select the 'edit' link on the 'About username' bar.