Forum:Registered Users only?

Is there any way to make it so registered users are the only ones who can edit the Wiki? Recently, we've had some spam issues and while I can block them, I'd like a way to prevent it from happening in the future. ~*Jen*~ 05:13, January 23, 2010 (UTC)
 * Wikia hosts public wikis which anyone can contribute to. If you need specific help for the wiki, you can contact Wikia via Special:Contact to discuss the situation and possibilities, and you'll need to provide as many relevant links possible. Happy editing. Joey (talk) 05:24, January 23, 2010 (UTC)