Deleting Registrants

I have no problem ADDING who I want; the problem is someone added ALL 350 kids from my school. Your interface is very clumsy in that I can't easily delete unwanted registrants; instead I have to send you a list of students' emails. But again, the interface is so clumsy that I have to scroll from the top of the list EVERY SINGLE TIME I access it, copy the unwanted address, paste it into your contact email form, repeat from the TOP OF THE LIST. Even if I'm at "F" students, the list goes back to the first "A" student. Last week, I tried to clean up this mess and it took me over 30 minutes to copy/paste 10 names. I will not spend my professional or personal time doing this. Again, this would be SO EASY if I could just click on a registrant's email and DELETE IT MYSELF.