Let me be the first to welcome you to Photrio, David! I dabble mainly in Alt. processes... carbon transfer being at the top of my list, followed by Kallitype, Cyanotype, gum, sometimes tri-colour gum, and gum-overs...
DM's... As I'm new to the moderation team, I am not 100% certain if it is tied to post count... if you hold your curser over someone's user name (Andrew O'Neill for example) a window should open up. Bottom left corner it will say, start a conversation... Have you tried that?