The teacher can enable, disable, and arrange only the interactive enrollment methods. Interactive enrollment happens when a user tries to enroll on a course. The user must do something to be enrolled, such as select a course and confirm that they want to enroll, or pay for a course. Non-interactive enrollment methods are checked when a user tries to log in to a course, for example, an external database or LDAP server. Only a site administrator can enable or disable a login-time enrollment method. These are not managed at the course level, but at the site level.
In the Enrolment methods section in Chapter 3, Configuring Your Site, you enabled a list of enrolment methods for your site. For each course, you can ...