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 Settings > System > Gestures > Use Three finger screenshot on.)

To scroll and capture more content, touch Full Page, touch the screenshot thumbnail to open it, then touch 
To stop scrolling before the end of the page, touch the screen.
Do any of the following:



Open the Photos app 