Car won't charge or play iphone music?

I just recently installed a boss stereo system and it's capable of USB connection among other things. But for some reason it says the accessory isn't compatible when I plug it up to the radio system. Would anyone happen to know how to fix this? Also I can't use touch screen unless in park but when I put it in park it still won't let me. If anyone is knowledgable about stereo systems please provide a detailed explanation that helps me understand this is happening and what I can do to fix it

Its not compatable and thus can't be made to do anymore than it does now
Touch screen - normally this has to be wired up to the handbrake warning circuit to let it know the vehicle is parked.

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