if you've used an android smartphone, the structure is generally the same for the tablet-ised version of it. most apps ususally have a menu fuction defined by the 4 horizonatal lined key just left of your right side Ctrl key (or the most far right of the bottom row of icons along the bottom of your screen, right of the previous apps icon). usually this allows you to change the in app settings such as e.g. sounds. most apps either exits out using the 'back' key, and home brings you...to well, as it says, your home screen.
everything else after that should be pretty much intuitive-ish, but drop another line of here if you get stuck with owt.