Instances activity tells you how many courses have this enrollment method added to them. However, just because a course has an enrollment method added to the course doesn't mean that course is using the enrollment method.
For example, the Trends in Tourism course has three enrollment methods added to it:
Note in the preceding screenshot that while Guest access and Self enrolment are added to this course, they are not available, that is, they are not enabled. The teacher or administrator will need to enable those enrollment methods for this course.
Note that self-enrollment is not the same as self-registration. Self-registration ...
