ya i got that part but hmm its still not working?????
Just like all controllers, you must associate the controller to the console. Easiest way is to simply power on the device by the guitar. Press and hold the X circle, and your xbox will power up and you'll see the lights circle and settle on the first controller slot.
If you powered up a regular controller first, and the guitar is second, I think when you start playing, it prompts you to say which controller to use.
If you plugged it in, and it's not powering up or showing the LED.. make sure the connection about 6" down the cable is secure. It's a barrel connector in the cable that allows the USB portion to separate. Make sure that is tight and snug. Might just be loose, and then the guitar doesn't do anything.