First off, this doesn't belong on the Twilight spot at all!
Anyways, you go to the fanpop homepage (www.fanpop.com), scroll down to about a little more than half-way and you'll see a title that says "browse clubs." Like right next to it is a button that says "create new club." You click it and you're ready to go (but please just make sure that there already isn't a spot for that thing) :]