If a user is assigned to be an instructor for a session in a conference, they will be able to view the attendees in their session. They will also be able to download a list of attendees and mark attendance.
Users should navigate to Conferences then select the correct conference from the list available.
Register for the conference if not already completed. For more information about registering for a conference, visit this article. Select the session.
The session list will indicate Session Instructor. The download link will show in the top left of the attendee window.