I need to get to the back of my radio to plug an RF modulator in to it where the antenna plugs in for my delphi XM radio anyone got any idea how to get the I can not find any way to get there.

It's really not that hard, the trim piece that surrounds the radio and the instrument cluster all comes off as one piece. Just put your steering wheel to the lowest position, get a good grip on the trim then give it a good pull, after that the mounting hardware for the radio is exposed and you can remove the radio