This lets students enrol themselves in your course. You can put a password on so that not every student can just enrol.
NB: students who have self-enrolled must either unenrol themselves from the course when they are done, or the teacher must unenrol them manually. They will not be removed automatically when the course finishes.
(we recommend deleting guest access as this will make the 'Enrol me' button to be located in an obvious pace)
» Guide to Moodle