HOw to have the screen to stay on longer?

I just got my 7100, I am very happy, but I don't know much about it.
How to have the screen to stay on longer?
ANyone know a good video tutorial on the camera?
Thanks

Youtube is best.....................

The camera manual is pretty good too. See the camera C4 menu (page 215) about the LCD timeout. A longer LCD time does use more battery current.