In order to use a chat client you need one of two things: A chat client that requires no server. These are often database driven somehow. -or- A chat client that requires a server that is not on SimGames.net. Commonly, people choose to use IRC for this purpose. I use a $50 Java Applet called javirc on my site. I haven't found any free java clients that I like. However, some IRC networks provide a Java chat that you can link to or embed to make the chat appear integrated into your site. I can't be any more helpful than that at the moment.
Free Chat room Just go to http://www.freejavachat.com all you have to go is to put some HTML on your site!
Use this code: <iframe height=515 width=860 src=http://webchatting.com/chat/cbt01.php?nn=Guest&chatsel=blah> Edit ChatSel=blah to your channel name. Then you goto the chat place enter chat network change your nick: /nick <new nick> and then register it: /nickserv register help and then register the channel /chanserv help register Hope this helps