Since we went invitation-only back in January or so, you have to request an invitation to become a WikiTree member. Unless you're invited by a family member, you'd generally send a message to one of the "Greeters" on http://www.wikitree.com/wiki/Members_to_contact_for_an_invitation
What is a good one or two-word term for someone who has requested to join the WikiTree community?
I ask because we're working on a smoother system for all this. There will probably be a "guest member" level where you can only edit your own profile, post comments, and participate in G2G. You'd still have to request a full membership.
We could always change this later, but it would be nice to have the right term written into the code.
Update: The Guest Member / Volunteer system is now live!