I’m wanting to add three site administrators to aar2014.thatcamp.org/ in order to design and organize the site in advance of taking registrations. When I click on the «Add New User» lengüeta, it actually takes me to a page that says «Add Existing User.» I was able to add two of the three team members who I know had attended a THATCamp before by entering their email address and then clicking «Add Existing User.» But when I try to create a administrative user profile for a person who has not been to or registered for a THATCamp before, I type in their email address and get a «The requested user does not exist.» notice.

How do I go about manually adding users to a THATCamp site before registration has been opened?

Gracias!