Pro adds two managed ways to enroll students.
Approvals
Turn on Require Approval in a course’s settings. Students request a seat, and an administrator approves or denies each request from the admin.
Invitations
Pick someone who already has an account on your site. The next time they open the course’s page, they see the invitation and accept it.
Let people know yourself
Pro doesn’t send an email for a request, an approval or an invitation yet. Let the student know yourself, for example with a link to the course’s page. An invitation waits on that page until they sign in and open it.