Help:How to revert a page to an earlier version
Why pages should be reverted
Spamming is quickly turning into the number one reason why pages should be reverted. Spamming is when a page is suddenly filled with advertising links. As of this writing, cacheopedia does not support advertised linking.
If the edit does nothing to enhance the page, or is 100% wrong information, a revert is justified.
How to do it
If you are in the recent changes page, and see an edit, you can always hit the diff link to see what the changes were for that edit. If you happen to be a sysop of this wiki, there will be a revert link on the diff page. This is different from just doing a regular edit to remove the offending material.