Strip the wires to find GND, RX, and TX. You may need a multimeter to verify which wire corresponds to which pin on the USB-to-Serial chip (usually a PL2303, CH340, or FTDI).
Note: Some users have reported that the "Data" port on the front and the "Speaker" port on the rear can behave differently depending on the specific revision of your radio. If the front port doesn't work, some enthusiasts on the Digirig Forum suggest trying the rear 3.5mm port labeled "Speaker". DIY Build: Converting a Baofeng Cable qyt kt8900 programming cable pinout top
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Connect the pin of the module to the Tip (RX) of the plug. Strip the wires to find GND, RX, and TX