To use, just connect an antenna (either via the u.FL connector or with a pigtail) to the u.FL jack. When powered up, the module will supply 3.3v of active antenna power (this is short-circuit protected if you'r'e using a passive antenna that is a DC short), then connect to a host via the USB-C receptacle.
The host will see a CDC device. Open it and set the baud rate to 115200 baud and the format to 8N1. You'll immediately see NMEA sentences. When/if a good fix is available, PPS pulses will show on DCD. If you want them on DSR or CTS instead, then you can solder closed the relevant jumpers on the board.