You, as an event attendee, can display a QR code for the instructor to scan and confirm that you attended.
You must have registered for the event to be counted as attended.
In the app, go to the event you are attending. Events you are registered for can be found in the Learner workspace, under Training -> My Training. Scroll down until you see the QR Code.
Show the QR Code to your instructor so they can scan it and mark you as attended.