How do I get my mic to work in Paltalk chat rooms?

I recently joined up with Paltalk, a site that has hundreds of chat rooms with live audio and video, as well as a normal type message area. I can post but thats all and even that is very slow. I can hear and see the other chatters messages but I cannot figure out how to use a mic (built in or otherwise) and get it to work in the chat rooms. How do I use my mic in the chat room?