If the time you are cancelling is approved see this article:
To cancel an existing or approved paid time off request follow these steps
- Click the My Requests app on the Home page
- Find the request that you would like to cancel using the Pending or Approved filter on the top right
- Click View for the request
- Click the Cancel Approved Request button. The time will be credited back to your paid time off balance.
Note: To cancel time that has already been approved you must be an account administrator.