Adding Aux Port

I was just wandering if anyone knew of a way to install an aux port. I have an 06 nox. I bought it used and it is the only thing that I dont like about the thing. I know that there has got to be a way to do this I am just not that smart when it comes to wiring things. and all the aftermarket stuff wont work for the 06, I have went to many different shops and they all say the same thing, that it cant be done. Any help would be awsome