No, just click on the "Contact OSA" tab in the main menu at the OSA site. You don't need to be logged in or a member of the site. Just fill out the form, it forwards it to my OSA e-mail address, and that's it.
Considering how many folks have sent in questions, the feature is working; but if you still have troubles, just send me a PM here, and I'll forward you the e-mail address.
Also, as written in the FAQ on the OSA site, creating a username/password at UltimateMetal is different from creating a username/password at the OSA site. So if you're using your UltimateMetal name/password to log onto the OSA site, it won't work (and vice-versa)!