The employees can request a time off to be added, edited or even deleted. The admin(s) can approve those requests under the "Edit Requests" section which falls under Menu > Home and Menu > Overview on the web and mobile app respectively.
On Mobile:
Tap on Edit Requests
Tap on > "Approve" button to approve the request
On Web:
Click on > "Edit Requests"
Click on > "Approve" button to approve the request