First, look at the URL* and delete everything in front of 'com', so it just says www.fanpop.com. Then press enter. Next, scroll down a bit while looking to the right of the screen. You should see a long green button with 'Create a New Club' on it.
Hope I helped! :3
*If you don't know what that is, it's the bar at the top with 'www.etc' on it. Sorry if I'm patronizing you. :)