When you arrive at the event, show your QR code to the host or check in staff to be scanned. You can find your QR code on:
The event page (web or app) after logging in. Click the View ticket button near the bottom of your screen to pull up your ticket and QR code.
The text message you received after purchase (search for “You’ve got tickets to [event name]!”)
The host will scan your code to check you in. If there's no scanner available, the host can also check you in manually by searching your name.