1. Go to the screen you would like to create a screen shot of.
2. When at this screen, click on the Home button, and while pressing that button, press and release the On/Off/Sleep/Wake button at the top of the iPad (See below). When you press this button combination, you will see a white flash and hear a sound similar to a camera click.
3. The screen shots that you take can then be seen within the Photo app and can be imported to your computer via iPhoto.