Instructor self-signup is disabled by default. When an instructor creates and joins a course, additional instructors (professors and TAs) will not be able to join the course unless instructor self-signup is enabled or they are manually added by the original instructor. Instructor self-signup can be enabled or disabled at any time.
When instructor self-sign up is disabled, you can enroll other instructors under Enroll Professors/TAs via the Manage Class tab.
To enroll other professors or TAs, please visit Manage Class > Manage Enrollment > Enroll Professors/TAs and simply copy and paste or manually enter their email addresses.