If you receive an invitation for Selection Day, log on to your Teacher Track account. From there, you have two options for registering for a Selection Day interview. Along the right side of the screen, you will see a section labelled Events. Within this section, you will see a list of all Available Events to which you have been invited. Click on one of the Available Events to register.
Alternatively, you can click on the Events tab in the horizontal navigation bar along the top of the page (between the Application and Checklist tabs) and click on any of the Available Events that work within your schedule.