Instructions say to register then email with a short bio and HN name. I had to fill in both of those during registration. Do you still need the email?
Sidenote: Doorkeeper.jp has improved a great deal in the last few months. Check it out for a great event management system.
We've started this service in Japan, but have always had the international market in mind. If you're an organizer who holds regular events, we'd love to help you out. See http://www.doorkeeperhq.com/ or shoot me an email at paul@mobalean.com.