How do users start one on one chats?

Hi,

I just bought and installed chat. It says it can handle one-on-one chat sessions, but I can't seem to get this working. When I click the "Available" button on a users profile, a fragment hash is added to the url, the page is scrolled to the top, and nothing happens after that. Is this a bug/problem in my setup or does that button not do anything? If one-to-one chats are not possible, how do I go about requesting a refund?