The edit form of an enrollment is empty by default, however you can add additional fields to the enrollment content type to make them available in the edit form.
By default there are no columns visible in the edit form, but you can add new columns to the enrollment list/content type(s). If you want to display columns in the Edit Form but not in the “New Enrollment” form, make sure the ShowInNewForm field property is set to FALSE. To change this I recommend the SharePoint Manager (SPM) available on Codeplex.
If you try to edit an enrollment and you receive the error “Enrollments can’t be modified. Remove and reenroll”, you should install the latest version.