Ward, Check your inbox, just sent you a message.
There are two ways to message that I've found, although probably more exist.
1) Click on thier name as it shows on a thread like this one, then select the Personal Message option and the New message dialog will pop up with thier name pre-loaded.
Or....
2) Click on the member list, find their name, and then select the little monitor icon next to it and it'll bring up same.
Good Luck!