Click the Admin Panel button.
Click on Courses on the side menu and select the course you want to update.
Click the Enrollments tab.
To remove a user's access to the course, click the three-dot icon and then click the "Remove" option.
To enroll a user in the course, click the Enroll button. Then, search for the member you want to enroll and select them. Finally, click the Enroll button to complete the enrollment.