How does v cast song work?

How does v cast song work?
first you have to go to music and tones and then click sync . Their will be a pop up window that will say use windows media center and you click okay .next you have to go into windows media center if you have a windows or any other type of computer except for mac(i actually didn't do it for the mac) then u have to download it from iTunes or free music but i would prefer the free music then if u have the song then you have to click save target as and save it as whatever you want but i prefer saving it to desktop or a folder but after that you have to drag the song and if you have windows media center on the right hand side it will say sync music and you are done hope this was helpful