Forum:How can I stop unregistered users from creating pages?

As the title suggests. I'm finding more unregistered users creating inappropriate pages that should be in their blog rather than pages on the wiki. But I can't find anywhere to edit user group rights...help? Flying Banana (talk) 11:49, September 5, 2012 (UTC)
 * After a community decision is made, you can request it using Special:Contact. 13:14, September 5, 2012 (UTC)