I think this isn't correct. There's no usb or aux port available in new Civic. But yes, to confuse the driver, they have mentioned 'Aux' with CD button on the panel!!!
If you want to get a usb connection or an aux port, you'll have to do some 'jugaar', which I wont recommend. It is better to get the entire panel replaced with an aftermarket product that will accommodate all options that you want, including DVD, USB and Ipod.