You can use the up and down directions on the D-Pad to move up and down the list. The right- and left- directions move to the next and previous pages, respectively. You can also use right- and left- pagination buttons.
Highlight the book that you want to view and use the center select button on the D-Pad to open the book.
TIP: You can navigate to the Tab bar at the top of the page and move directly to your “I'm Reading”, “News and Mags“, “Documents” or “Store”.