The PTO Manager approves the PTO's for you.

The Salesforce Administrator at your org adds your PTO Manager name to the user screen for you. 

The same PTO manager will approve your PTO's.

The PTO Managers Approve/Reject your PTOs from the PTO Approvals screen in Salesforce.

Once the PTO Manager Approves or Rejects your PTO, you see the PTO Status change in the Mobile Time Tracker application in the PTO Recent list.