It would appear now that as a registered user of the site, but not a member of AOMCI, I do not have permission to pm members. Unfortunate, but understandable I guess.
If you are a registered user yes you have limited access. Yes you can pm members on this site not with a direct click of there name in red but thru your personal account. When u are logged in click private message then add recipient type name you want message to goto below box click add then name will appear to the left write your message and send.