The Remote app is designed to turn your phone into an iTunes remote. What you do is open the application up, then go to the nearest machine running iTunes and open the software. On the list of mobile devices that it is reading should be your phone. Go into your Remote application and select either Change or Find Library. From here you will be able to add a library, and it will then give you a four-digit passcode. Go into iTunes on the computer or Apple TV that you wish to control, select your mobile device, and enter the passcode where it tells you to. Now you can control the library, playing the files that you want, searching for media you would like to find, and even controlling the volume.