How To Cancel Edits
If you've made a mistake, it is possible to cancel your own open edits.
Status: This is a good idea, but Needs Intertwingling badly!
It is much better to do this than trying to enter a (for example) Remove Release Edit. Cancelling your own Open Edit is immediate, while all edit types that might possibly result in Loss Of Data must be voted upon.
How To Do It
A list of your edits will then be displayed, most recent first. You can cancel any that are still open for voting by clicking on the "Cancel" link.
Note that it's not possible to delete closed edits.
You enter an Add Release Edit, but then realize an identical release already exists in the Database.
When Not to Do It
If other users have added data to your edit, or if only minor corrections are needed, then it may best to allow the edit to go through and correct it later.