When you turn on the option to Issue receipts, receipt files will be created, in the chosen folder, using the chosen template. Additionally, on each of the various buy-in, rebuy, add-on, undo buy-in, etc, dialogs, there will be a Salesperson drop-down list so you can select a salesperson. This is actually a combo-box, meaning you can add a new person to the list directly without having to go back to the Preferences tab to do it.
If you have the Print receipts option checked, each time a receipt file is created, it is also sent to the printer. The TD can't actually print, but it will pop-up the print dialog so you can print the receipt.