For many reasons, you might need to cancel a request you've made.
If you have a lot of active requests, you can sort them by Performer, Project, etc., to find the one you need to cancel.
As usual, the Request Detail for your request will appear in the lower right pane.
Clicking the Yes, cancel button in the dialog notifies the Performer (and Observer, if any) that the request has been cancelled and removes it from your Due To Me folder.