While in the library view, press the menu button will open a group of options:
Sort By – Sort the library
My Purchases – View all purchases on the account
Import Book – Import DRM free EPUB content
Settings – Toggles for device activation and 3g/4g warnings
Support – Open the support center
Reading View Menu
Tapping the menu button while in reading mode will give the options to add bookmarks as well as guided zooming/font settings. To access the other features, tap the center of the screen to open the nav bars.