Help:Reverting Content to Previous Version
When you revert an article to a previous version, you are eliminating the edits of one or more contributors. It's a good idea to contact those contributors and discuss it with them directly. At the very least give your reasons on the Talk page and explain what you intend to do. Then, let some time go by, giving others a chance to reply to your ideas. In the long run it is better to negotiate permission before hand, thus smoothing over possible hurt feelings and preventing a Revert War.
Also, consider the Three-revert rule  if doing a revert or extensive editing.
When you are ready to revert an article to a previous version, do the following:
- Navigate to the article that you wish to revert.
- Click on its View History page.
- Choose a previous version and click on its (undo).
- The article for that date should now open in an Edit Window.
- At the bottom of the page under the Edit Window, fill in the Summary.
- Then Click on the Save page button.
- Do not revert any page or any part of a page more than 3 times in 24 hours. Doing so may lead to action being taken against your account by an administrator.