change of location of itunes folder

a itunes folder was located in my c drive(os drive).path for that folder was c drive-user-my music-itunes.

due to less space on that drive cut that folder from that location and pasted it on another storage drive(d drive) of same computer.now my itunes libraray does not show any apps or data. my iphone is with service centre for service, when i went to prefrences and changed media folder location i was unable to get anything. a "reset" button is also there below change.shold i click the reset button to locate data of my itunes libraray or it would erase my backup and other contents.