So I just entered all 600 of my guests into The Knot RSVP. I had a friend try it out for me before I send out invitations that way it works. She said everything worked except it wouldn't let her submit her RSVP unless she entered any kind of email. How can I change that so that when people type in their name they just click Y/N and submit? I don't want them to have to enter any email address.