You can take a screenshot a few ways. Use the one most convenient for you.
When you’re on the screen you want to capture, choose one:
Touch & hold three fingers on the screen. (If this doesn't work, turn Use Three finger screenshot on.)

To scroll and capture more content, tap 
To stop scrolling before the end of the page, tap STOP or 
Do any of the following:





If you tapped 







Open the Photos app 