This forum software is SMF 2.0 and for the chat, there's free chatboxes over the internet that you can use and there's a built-in shoutbox. You can also upgrade your forum to include a chatroom system that utilizes ajax for a 1 time fee of $30. You can try it out here:
http://support.createaforum.com/chat/index.phpIf you still want to use PHPFreeChat, I actually wouldn't know how to change it to work with this forum software.