I can't delete music off of my Samsung Intensity?!?

When i bought this phone i said this phone wasnt good at all. when my brother added some songs like 4. know i tried to earse those and put new ones but i cant seem to find my music. this is what i do: i plug in the usb cord then i click on sync digital media files to this device. then i get stuck! can anyone help me? and does the Samsung Intensity have a lot of memory?
 
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