Info on how to change the back brake light on a chevy malibu maxx 2004?

Does anyone know how to change the top brake light on a 2004 chevy malibu maxx? I have the hatch back. I took it to the dealer and they said they dont know how.Info on how to change the back brake light on a chevy malibu maxx 2004?http://www.google.com/search?q=Info+on+h