If you have a ticket for Collision 2021, you can login to your ticket dashboard at: collisionconf.com/my/cc22/login using the email address your made your order with. A login link will be sent to this email.
If you weren't the person who made the order but know you have a ticket assigned to you, you can also login at collisionconf.com/my/cc22/login and view your ticket.
This short video (from Collision 2021) will guide you through the process of logging into your dashboard and assigning or claiming your ticket.