Accidentally mark an application as sent before you actually sent it? Marked an opportunity as audition declined when you received an audition? YAP Tracker allows you to undo any setting you may have made when using the personal tracking of the site.
To undo a setting, go to the detail page for the opportunity (that's the page that displays all the information about an opportunity). Scroll to the bottom of the page and you'll see the Personal Tracking section. Here you'll be able to undo any setting made in error. Note that if the final decision still hasn't been made, you should also make sure that Unknown is checked in the result section.