On most Android phones, you can take a screenshot by holding down the Volume down button and the Sleep/wake button simultaneously. Hold these buttons down until your screen flashes.
To view your screenshot, go to the photos section on your phone and look for the screenshots album, tap to open it, then select the screenshot to view. You can use this feature to attach the photograph to your assessment.
Every phone is different so googling how to do this on your particular phone might be best. We've found this article quite useful.
On any iOS device you can either take a screenshot by holding down the Power/Sleep button(on the top-right of your device) and click the main home button in the bottom-centre simultaneously. Or hold the home button and click the power/sleep button, your screen will flash briefly.
To view your screenshot, go to the photos app on your phone (this is not in the Photo Stream, but in the main Photos section), you can use this feature to attach the photograph to your assessment.