ENDER 3 - V3 LED Light Accessory Included instructions are a little vague. Hope this helps. Once connected the light works great and is really bright. This you tube video helps although is a different model but motherboard connections are located as per attached image. https://youtu.be/tDFLqhUSvhA?si=6THmTZzJd2Qfinc5 Remove the power cable before starting any work. You need to add the light bar to the top at the rear. There are two screw holes available to attach the brackets. Align so connections are to the right of the printer when looking at it from the front. Watch the video which describes how to attach the terminals. 0 to 0 and 1 to 1. Make sure they are secured, they won't slide off if they are. Connection to LED strip only fits one way. The rubber adhesive strip is a channel for the cable. Make sure you give clearance at the bottom in case you use the spool attachment. You do need to remove the bottom panel by removing 8 screws. Be careful removing as a fan is attached to the bottom panel inside. Prop it up carefully. Look at the image to connect the cables to the correct terminals. The you tube video shows how to attach them. Slide the cable through the cable hole in the side of the case before attaching the cables. Loosen the two screws which have the red crimp plastic sleeves indicated in the image.. Positive is red, black is negative. Slide the LED crimp terminals inside with the existing crimp terminals and re-tighten, they will fit in the same hole. Don't over tighten just check by hand that all cables are secure. Secure any loose cable with a zip tie and re attach the panel and 8 screws.