Begin by locating the iPad's hold button. This button is on the top right-hand corner of the iPad.
Press the hold button for a few seconds, until a red slider appears at the top of the screen that says "slide to power off."
Slide it to the right. (If you don't want to shut it down, tap the "cancel" button at the bottom of the screen.)
You'll see a small wheel and then the screen will go dim. The iPad is now shut off.