If you need to edit a leave entry, navigate to the month in which the leave occurs (you can edit both past and future leave entries) on your Leave : Review page and follow the steps below:
Click on any day within the leave entry.
The Leave editor will now pop up, giving you the ability to edit all aspects of the leave entry. Navigate to each section via the top tabs.
Once you've finished editing, head back to the ‘Review’ tab and hit "Update".