I cann t put music files on my iphone .

If you can't sync music to your phone here are some things to check:

 

On the summary tab of your iTunes sync settings you have checked "Sync only checked songs and videos"In your music library you have checked all the songs you want to sync to your phoneThere are no exclamation points next to any of the songs you want to sync to your phoneYou have authorized your computer for all Apple IDs for purchased music you want to sync to your phone (in Store>Authorize This Computer)You have checked "Sync Music" on the Music tab of your iTunes sync settings

 

When these all look correct, sync your phone and your music should transfer.