Do one of the following:
Touch & hold three fingers on the screen. (If this doesn't work, turn Three finger screenshot on.)

To scroll and capture more content, touch
. (If you don't see
, turn Screenshot editor on.)
To stop scrolling before the end of the page, touch STOP or
.
Do any of the following:
Touch Save.
Or, touch Discard to delete it.
Open the Photos app and touch Library > Screenshots.
You can adjust settings for capturing screenshots at any time.