Taking a screenshot on Moto E involves the following steps-
- Make sure you are on the page you want to take screenshot of( This step is quite obvious).
- Press and hold Power and Volume down button simultaneously for a couple of seconds.
- Release the buttons once you hear a camera sound.
- Your screenshot will be stored under Gallery in the Screenshots folder.
The method to keep the buttons pressed is a bit cumbersome and may also fail some times. You can also opt for some third party screenshots apps that will help you take screenshots.