Choose which screen that you want to capture, As iPad, iPhone or iPod touch i.e. Any iOS device will capture screenshot of your display or screen in .png image format & which will be stored in your photos app library.
Hold down On / Off Switch
Press Home button once.
(You should press home button only once without holding it too long as it will shutdown you iPad.)
Screenshot is taken & stored & saved in you photos app library…!!!
Hope it helps!
Thanks & Regards