|If you've seen a genuine article being vandalised, don't edit the change out unless it's minor or you have new information to add. Instead, edit a previous, non-vandalised version from the history or roll the article back to that edit - this way, information doesn't have to be constantly republished.|
For cases of major vandalism or new articles being created with spam content, please post on User_talk:TeamCodex with the offending article so it can be brought to a Moderator's attention, if you cannot deal with it yourself.
Help:Protecting and unprotecting pages
|Important note: When you edit this page, you agree to release your contribution into the public domain. If you don't want this or can't do this because of license restrictions, please don't edit. This page is one of the Public Domain Help Pages, which can be freely copied into fresh wiki installations and/or distributed with MediaWiki software; see Help:Contents for an overview of all pages. See Project:PD help/Copying for instructions.|
Protecting and unprotecting pages is very straightforward, but these operations require sysop permissions.
You can designate a page as a protected page by clicking the 'Protect page' tab, and supplying a comment (a brief textual description of why you are protecting the page)
There are several reasons why a particular page might be protected. On public wikis, a protected page is usually one which has been repeatedly targeted with vandalism, or where it is believed that any vandalism would have an unusually severe impact. On corporate wikis, a page may be protected when the content has been frozen via an approval process. However there are also many good reasons for not protecting pages. As a sysop you must make this choice, and wield your power responsibly.