Waitlist: How a student can add themselves to a waitlist is confusing to them

The way a student can add themselves to a waitlist is confusing to them. I get multiple calls/emails indicating they thought they were already in the class but it shows 'added to waitlist'. What it actually says is 'add' to waitlist. Is there a way to distinguish this differently? Perhaps add a button that says 'click here be added to the waitlist'. That button changes to 'added to waitlist' so if they come back in, they see they already are.