It's also in the browser menu. Hit the menu key, then View, then Fullscreen.

...and since this is all ready after being cut n pasted in another thread:

http://tabletschool.blogspot.com/

is one of the best places to start, imo no matter what your technical level. It shouldn't take more than a few hours of viewing these youtube vids to really understand your tablet. The site was thought through and done very well.

Joe