Capturing a screenshot on an iPhone, iPod or iPad doesn’t slightly differ from a device to another. For example on Samsung phones the process differs, on old Windows Phones there is no a screenshot feature even. So, iDevice users are a little bit more lucky.
Usually taking a screenshot is not more than clicking two buttons. Locate on your device the Home button and the Sleep/Wake button. The location of the buttons may differ because of the exterior design on iPhone, iPod or iPad models.
To capture a screenshot, stop there where you want the shot, press and hold Home button, followed by the Sleep button. The screen should flash white, signaling that the screen capture worked correctly. The screen capture will be saved in the photos gallery.