Steps:
Enter the sale details
Press Shift-F1 to bring up the Shipping Information
screen:

Invoke ShipRush by double clicking on it in the System Tray.
Find the customer by typing in a few digits of
the name or company:
ShipRush pops up:
Process the shipment. ShipRush
updates the Shipment Information screen with the tracking number (and
charges, if so set in ShipRush settings)