there has to be other people in the chat room to talk to. and they have to want to talk back to you.
Right now it is saying there is 1 person on chat, so he\she is talking to himself. You can set up a time with others to meet there to chat if you want. Not sure how many can be chatting at once, that varies depending on the site and software.
I never use it myself..
Hope this helps a bit.
Russ