Notification for Time Approval ByDesign

Hello. We are turning on required approvals for employee time. This will allow the project managers to approve the time that is being posted against their projects. We have been told that there is a way to set up an email notification to the project managers that they have time to approve. We have also been told that, if rejected, a notification can be sent to the employee.

Can you help us with the steps to turn this on?

Thank you!