I signed up for an account here a few months back. I just received a message from another user asking for help with something. I think I can help him so I want to respond, but when I try to reply (by following the link in the notification email that I got about his message), I get "You are not allowed to send personal messages." I tried looking at the help pages to figure out why I might not be able to send personal messages, but the only thing I see that could potentially be related is that personal messages cannot be sent by guests. I have no idea how to see if my account is a "guest" account. If you have any ideas about why I can't reply and how I can fix it, please let me know. Thanks.