Connect one side of the 1/4-inch guitar cable to the guitar and the other side to the "Guitar" slot on the converter.
Plug the USB cable into the converter "USB MIDI Out" slot and plug the other end of the cable into a USB port on the computer.
Open music software and create a new MIDI file. Press the "Record" button and play the selected notes on the guitar.
Press the "Stop" button in the software and listen to the recording. Delete and re-record the selected notes if you are unsatisfied with the recording. Save the recording to your computer once you're finished editing.