Taking a screenshot on an Acer Iconia A500 tablet, running Android 4.0 or later, is easy, once you work out how to do it. Unfortunately its not very easy to work out how to do it without reading it somewhere, or someone telling you how.
To take a screenshot, press and hold the power button, and the volume button closest to the power button (The action of this button differs if you rotate the tablet) at the same time, and hold them for a couple of seconds. It should then save the current screen as an image file on the device.
To take a screenshot in landscape mode:
Hold the volume down button and the power button at the same time for a couple of seconds.
To take a screenshot in portrait mode:
Hold the volume up button and the power button at the same time for a couple of seconds.
