I thought you said you had over 1000 members. I visited your site and you only have 34
You misunderstood what I meant, or I explained it poorly. Our organization has about 1000 members. I have only very recently installed forums on our site at www.aka.org
and only a limited number have so far signed up. At present, I have left it that members have to register themselves, using their membership number and password, which are assigned by our membership committee. Even though I have explicit instructions in red text on the registration agreement page, some of them still try to register using handles. When they try to join a members only usergroup, I then can't tell whether they are AKA members.
So, I would like to find a way to do mass registrations, importing from a tab delimited file (or equivalent) that would include, say, user ID (= membership number), password, and email address.