I don't know the answer to that question. In earlier versions of LW there was a specific Browse Host button. There was also by default the little sun that indicated a host had chat enabled. But then when I updated from LW 2 to LW 4 this had disappeared. It took me ages to find out how to chat with someone. Also the chat display column needs to be set from right-clicking for windows or control-click for mac ontop of the column bar.

Late edit: Some more on Setting up Chat (click on link)