HOW TO ATTACH LED KIT: Before you start the procedure, make certain to unplug the control box and turn off the power button. Then you can start to remove the left panel cover of the CNC router in order to get access to the cable wirings. You will notice that the connector for PTS-901 is disconnected which is the one for LED Kit. The wiring colors for PTS-901 are the following: Yellow, Green, Red and White. Now, you will connect the LED kit to the PTS connector. Feed the Led kit wire through the hole on the left side panel. Then place the LED Lamp Under the X-Axis aluminum extrusion lower bracket. If you have any other questions please let us know.