You might have noticed the process for becoming a participant on this site follows a slightly unusual (or at least unfamiliar) process.
We use one plugin to control the self-registration process, an automated enrolment into this Teachers Area, and meta-courses for enrolling you in all other courses too.
You are a Non-editing Teacher.
If you want to investigate these options you can reference:
Email-based self-registration with admin confirmation https://moodle.org/plugins/auth_emailadmin
SignUp plugin: https://moodle.org/plugins/enrol_signup
Meta-course enrolment is then the standard Moodle system: https://docs.moodle.org/32/en/Course_meta_link