The trivia game is hosted on live chat. You can access the various different channels from the Home Page here at POF. If you look on the right hand side of the home page, you'll see a link to chat, enter the nickname you'd like to use and click enter. Be sure not to use spaces in any nickname you use. This will take you to a Java chat application.
To join the trivia channel, type /j #piratetrivia or /join #piratetrivia. If the game is not actively running, type !trivia and it will start.
If you are unfamiliar with the live chat and need help, feel free to ask one of the Ops/Mods - they have the @ symbol next to their names.
Some handy links regarding chat - a lot of us prefer to using mIRC, so I've added the link to a guide for setting that up.
http://www.disneyonlineworlds.com/in...Chat/IRC_Guide
http://www.disneyonlineworlds.com/index.php/MIRC_Guide