Go to Course Tools and choose Classlist
Select Add Participants button
Choose Add existing users
In the search field, enter their name and click on the search icon (magnify glass)
Select the checkbox next to their name and under Role select
HVC – Instructor Assistant (Non-Cascading) to add users as Instructor Assistants or Faculty to the Org
HVC – Student (Non-Cascading) to add users as Students to the Org
Choose Enroll Selected Users button