I dont understand something, how a student can subscribe or apply for one course.
For example, the teacher X created a course abc. X has no students for this course and he is willing for a group of students. He put a registration key to attempt abc. So he is waiting for students.
Student Y occasionally found course abc and decided to apply for this course. When he clicks on the name of course the system request a registration key for this course. Of course the student has no idea about which registration key is.
Student Y wants to ask from the teacher X about registration key, but Y can not find in the system the email of X.
So Teacher X are waiting for students, and he dont know that somebody want to subscribe for this course, and student Y will close the browser window because he dont know the registration key and dont know how to obtain it.
How can I solve this situation????