Umm....call them?
Well, you can PM them from their profile screen and see if they can meet you in the chat room? That's about the best you can do. There is no instant message function here. But, if your friends share their Yahoo IM id, or AOL AIM id, etc., you could IM that way.
Also, there is a way in the chat room here to set up a private chat room, so you can talk privately with your friends. I haven't played with it, so maybe someone else can help you with it, or you can play around with it yourself to figure it out.
Have fun!! emmy