Employees can sign in and request Time Off (if you allow them on your SETTINGS>Global Employee Permissions page). The Time Off Request is then sent to the manager to be approved or rejected. On your Settings>Employee Permissions page, you can also change this option to allow Employees to enter their own, already approved Time Off.
The Manager can be notified, by email, of the pending request and sees the alert "X Pending Time Off requests" in their "What's New" section on the home page or at the top of most other pages. Clicking that link takes you to the Pending Time Off page where you can see the days and times that they are requesting off and a list of any shifts that would be affected.
To Approve or Reject a Time Off request: