You cant synchronize with ITUNES to a Coby MP3 player. Itunes will not recognize the device. Also, Itunes are AAC format which this unit doesn't recognize.
If you have MAC. plug unit into computer, it should show up as NO NAME on your desktop, you wuold have to drag/drop your MP3 file to this location.
If your interested in converting ITUNES to MP3, here is how you could do it on ITUNES "this does not work for purchased music" -