I beleive I set the number of messages required for full membership to 5. But I wouldn't worry about it too much... Full membership does not entitle you to any benefits. It's just a title. (And it's probably a feature of the message board that we will omit when upgrading to our own customized version of the software).
Incidentally, you are welcome to post technical (non-dance-related) questions to this message board. But it would be better if you would direct them to the appropriate forum. Your question would best be suited for the "comments box". After you have read the replies, I will probably move it myself.
Regards,
Jonathan Atkinson
www.ballroomdancers.com