I'm going to look dumb, but I'm trying to install XM radio using FM modulator... I have everything hooked up but cannot find any of the antenna wires to hook up to (to vehicle audio stereo, AM/FM antenna) and how about the 12v power terminal?
can someone please help!?!?!?!??!

 

sounds like you didn't find any connections that you need to make. pull out the stock headunit and unplug the antenna from it. then plug that antenna into the XM box, and the XM aftermarket antenna into the headunit. then you tap a constant (battery) source, accessory (switched power), and your ground. set your preset for whatever the FM modulator is set on, and you're done!