Go to Apps -> App Store
Click 'Configure' on the Payroll tile.
Toggle 'Enable PushPress Payroll' to ON.
You will now see a new menu item under the Apps menu called 'Payroll'. This is where you will manage staff pay.
Payroll items will start accumulating from when the above is turned on, it will not add past items.
Next step is to set up your Staff pay rates. Instructions here.