Wikipedia:Ultraviolet/Documentation/Rollback

One of the most useful features of Ultraviolet is the updated rollback menu, which offers many different ways to rollback an edit. When you go to the most recent revision of a page, you will be presented with multiple rollback icons. More options can be accessed from the More Options Dialog, the options that appear can be customised in preferences. These options vary from a quick rollback with no reason, to a rollback for copyright infringement. If you see something that doesn't meet any of the options, you can simply click the blue button simply labelled "rollback" to write a custom reason.

Except for clear cases of vandalism, you must not use rollback without an edit summary (nor explicitly mark an edit as "vandalism", which using rollback in this manner is interpreted as by convention). Two related mistakes to avoid: i) edits that are patently poor and/or inappropriate, but which could have been made in good faith, are not to be treated as vandalism; ii) new users often make test edits ("can I really make live changes to a Wikipedia article?"); if you ask yourself whether an edit could have reasonably been a test, and you cannot tell or find previous recent warnings for such edits, do not mark as vandalism.

Sometimes, multiple users have made separate edits, and you need to revert to a previous revision. To revert to a previous diff, simply preview the diff and press the "Restore this Revision" button. A new dialog will popup prompting you to enter a reason. When you are done, press.