Taking a screenshot on iPad is very simple and is same as on you iPhone. First, press the Sleep/Power button (located on the right top of your iPad) and the Home button at the same time. Once you done that, the screen flashes white, and a screenshot will be automatically saved into your Photos/Camera Roll. Go to your Photos, find the screenshot, and then you can email it, or share it on titter, Facebook, and etc. Screenshots are saved as png format.