Also see the help page for regular users.
As an admin you can manage the rounds and users and view all submitted material.
Rounds and users are grouped under courses. Admins are linked to those courses, only
linked admins can view the information under a specific course. To clean up your
workspace you can remove yourself from your own courses. Note that when a course has
no admins left, any admin can add themselves again, such that a course cannot
become locked.
You need to gain permissions from an existing admin to get access to a course.