The Navigation Menu will allow you to explore the various features of the app. The Navigation Menu is basically a sliding drawer that slides in from the left hand side of the screen. You open the menu by touching the handle and sliding it to the right. You can close the menu by touching the handle. Also, the icon in the upper left corner acts as a toggle to open or close the menu when touched. In landscape mode on larger devices, the menu will always be displayed so there is no need to open and close it.