There are two types of self-enrollment:
Are you an OpenEdu examinee? Yes, please refer to the following article: "OpenEdu: How to enroll into an exam?"
Check with your exam organizer if it is required to register in Calendar or not. If the registration is required, ask for user guides on how to do this.
If the registration is not required, then proceed to your exam throgh the learning portal of yur organization or an LMS according to the scheduled time.
NOTE: Examus Customer Care specialists do not manage exams schedule and do not conduct exams and quizzes. All enrollments are done by exam organizers or universities.