To private message just click on the the person's user name. This takes you to the next page where you click on send message. Just type the message and send.
Hope this helps.
Best wishes Sam, Facilitator
Hope you all have a great time meeting up! Just to say, I have told our press team about your meet-up and while they're not able to do anything today they are often asked for case studies about people who have met up and made friends through support groups or the forum etc. So if you would be interested in being contacted when we get requests like this from the media, please email email@example.com.
It's also the kind of story we like to feature in our Vita magazine so if you'd like to email firstname.lastname@example.org, Laura (Vita's editor) will get in touch with you about that.
Enjoy your meet-up!