Follow this diagram to add an HC-05 Bluetooth module to the Arduino board:
Now the Arduino doesn't need the USB cord anymore and it's directly powered by the 12 volt power supply.
To pair the HC-05 module with your computer, use the default password "1234".
Check the device properties on your PC to see if it is correctly paired and the COM port is available:
Now, for ease of use you can put all together in a nice enclosure:
Enclosure for the Cock Hero Machine.