What does the PM function refer to?
The Private Messaging system. You can access it by clicking the "My Messages" link in the blue bar near the top of the OC.net forum screen (in between "Profile" and "Calendar"). We prefer you use this to, say, posting your email, since web bots can indeed pull your email from a public post and then add it to their spam lists. Your email in the profile, and the link to it, are protected from this since only members can view them.
"O Cross of Christ, all-holy, thrice-blessed, and life-giving, instrument of the mystical rites of Zion, the holy Altar for the service of our Great Archpriest, the blessing - the weapon - the strength of priests, our pride, our consolation, the light in our hearts, our mind, and our steps"
Met. Meletios of Nikopolis & Preveza, from his ordination.