Load the DigiUSB→USB2LCD example on to the Digispark with the LCD screen shield connected.

Use the send or monitor programs in the “Digispark - Example Programs/DigiUSB” folder (included with the download) to send data to the LCD, each line sent gets put on the next line of the LCD (looping to the top) and sending a “¬” - not sign will toggle the backlight.

This should provide quick LCD integration, probably the cheapest USB2LCD solution, and a good jump off point for use of the LCD and DigiUSB libraries.