HiI assume you have one of these "thumb" drives or keychain drives, whatever you care to call them.Well, plug it into your USB port (some of them will light up to tell you it's connected; some are...
USB 1.0 and 1.1 had a specified maximum data transfer rate of 12 Mbits/s. USB 2.0 has a theoretical maximum data transfer rate of 480 Mbits/s USB 3.0 will have a theoretical maximum of 4.8 Gbits/s.
open the USB on your computer and copy the song(s) you would like to transpher. then paste these songs on a common location eg. desktop,documents... then drag this new icon on top of your itunes...