Iphone6 and uploading music

I recently purchased an iphone 6. i ve been trying to upload music into it. And my coimputer openes the program and even reads my iphone. when im trying to drag the music into my list it wont let me.. this simbol appears as soon as i get to the itunes page

http://www.google.com.mx/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact =8&ved=0CAcQjRw&url=http%3A%2F%2Fwww.dkauffman.org%2Fmx%2Fphotoshop%2Ftutorial%2 F2009%2Fno-fumar%2F&ei=0MPvVO3FENeyyATYoYCwCQ&bvm=bv.86956481,d.aWw&psig=AFQjCNE ODIXhxeyg0gtmd9uvcUiA66bd1A&ust=1425085768518377