Coming from pre-4.0 Android, to get to the "Menu" for an app, you'd hit the "Menu" button. In 4.0, there's support for this, but the Nexus lacks a Menu button. So how to get to settings? Look carefully in your apps - you won't see it in the exact same place every time - if there's a menu to be displayed, SOMEWHERE on the screen you'll see three small, stacked, square dots. Press it and you should get your menu. This is probably documented. Who reads manuals? No one. Who reads forums? Everyone.