You can leave a message on the board for anyone, just direct the message to that person and then what the message is about, for EG, for "Anyone" just type in the SUBJECT WINDOW "Anyone RE: Leukemia" or "Anyone RE: Side Effects".
You can direct the message to one of the Councelors, for EG, type in the SUBJECT WINDOW " Janelle RE: Leukemia", it is as simple as that.