You can modify the enrollment (i.e if you want to change the teacher, the course, or the cost of the course).
Only the user who created the enrollment has permission to modify it. School administrators and teachers can create and modify the enrollments of their organizations.
Click on the edit icon at the bottom left of the course under the enrollments section, shown below.
You will then be redirected to the Edit Enrollment Details form.
In the image above, the user intends to edit the course duration. When they hit the Save button, the enrollment will update successfully.