PM=personal message
On each post, below the persons screen name and location, are some icons; hold your mouse over the one that looks like a quote cloud box (whatever it is) and it will say "Personal Message" (and tell you if they're online or offline); click that a the PM box opens.
You can also click on their screen name and that will take you to their profile and send a PM from there; other info is in profile if they input it but I looked and baf doesn't have any other contact info.