To take a screenshot on an Android device running Ice Cream Sandwich (Android version 4.0) or later:
Press and hold the power and volume down buttons. On some phones, such as the Samsung Galaxy S3, S4 and S5, you'll need to press and hold the volume down and home buttons instead.
Release once you hear the shutter noise or see the screen flash.
The screenshot will be stored in your phone's Gallery, where you can access it and attach it to an email to Support if requested.