Hi. It work the same as reborn actually. So you have to go into your documents, then the Saved Games folder, and then the Rejuvenation one.
If you have the back up activated, you will see a Game file, and then other files with the name of your character, the time played, and the number of badges you got. You just have to delete (or maybe just move to a back up place in case something goes wrong) the Game files, and rename one of the other files as Game (use the time played to choose). Hope that help (and that you have back-up activate :p).