How do you add your iPhone to your iTunes site ?
On your iTunes, open preferences and go to the advanced tab. On the general section select the checkbox labeled look for iPhone, then connect it to your connected computer, authorize the iPhone as a remote for your iTunes library and generate a passcode. For more information, go to http://lifehacker.com/398278/remote-app-controls-itunes-playback-from-your-iphone.
When you plug your phone into your computer iTunes will recognize it.
Download iTunes to your computer and then just plug you iPod or iPhone into the USB in your computer and then iTunes should recognize the device and it will tell you what to do.