Forum:How to forbid anonymous edits?

Hello! I'm the Mass Effect Answers wiki bureaucrat, and I need information on how to forbid anonymous edits on this site. I know it's a harsh move, but it's necessary (due to an ongoing technical problem with server cache update). I need to know whether it can be done internally (by user rights management), or does it require Wikia staff assistance? I would greatly appreciate help on this matter. Mitranim 15:59, August 17, 2011 (UTC)
 * I believe this is a Special:Contact matter, but IIRC, it's only done when there's a history of heavy vandalism. –  Jä zz  i  16:08, August 17, 2011 (UTC)
 * (edit conflict) You'll have to start a community discussion, and then cite the discussion in a Special:Contact message. Staff don't usually block anonymous editing, but they may in cases of extreme vandalism or other extenuating circumstances.