For Android users
Open the screen that you want to capture.
Depending on your phone:
Press the Power and Volume down buttons at the same time.
If that doesn’t work, press and hold the Power button for a few seconds. Then tap Screenshot.
If neither of these work, go to your phone manufacturer’s support site for help.
On some phones, at the top of the screen, you'll find Screenshot capture.
For iOS users
Depending on the iPhone that you are using, please find a detailed guide on how to take a screenshot here.