I've seen certain cars with an ipod connector of some form running through the glovebox to the headunit
Does this require a certain spot in the back of the head unit?
Umm how do I take out the glovebox in my 93 honda accord?

 

you have to buy a head unit with an ipod interface, or an aux input. an aux input will not charge your ipod directly and you'll have to use the ipod to change tracks. a newer head unit with ipod control will let you store the ipod in the glove box, charge it, and let you control it from the head unit.

the glove box usually comes out with 7-10 screws, including some inside (all visible) and some on the bottom hinge. you usually remove the passenger lower dash panel to expose the glove box screws.