Depending on the device you use, there are different ways of doing it:
For Android devices:
- Press the On/Off + Volume down buttons for a few seconds.
- For some devices, mainly for those devices with older Android or Samsung versions, those buttons may be the On/Block + Home buttons.
To verify if the screenshot was taken correctly, enter the photo gallery and look for it in the "Screenshots" section. Whenever you take a screenshot, the device will make a shutter sound; this will also help you to know if it was taken correctly.
For iOS devices:
- Press the Lock (on the right side of the device) and Home (in the center of the device) buttons at the same time. If the screenshot is not taken, try again until it becomes effective.
- In case your device does not have the Home button, press the side button and the button for turning the volume up at the same time.
To find the screenshot, go to the device's Gallery, then to Albums and go to the Screenshots folder.