You can direct the student to sign up for your class via the portal. Also, Business Advising can help them.
If you happen to know that your prospective student is an Open University student, their ability to join your class is at your discretion and must take into consideration the seats available in your room. We are required to adhere to Fire Marshall rules on capacity of the rooms--more on that below.
Here is a special note from Mike Rehg that applies to this semester's situation: