Why won't iTunes let me put music on my iPhone?

I just updated my iTunes last night with the intention of putting new music on my iPhone 4S. I have music on my iPhone from different computers, so I don't want to sync my phone and lose everything. This new layout has me really confused. I drag the songs I want on my phone over to where my phone name comes up, but it won't let me do it. Does anyone know how I can do it?

Take your index finger and place it inside your butthole

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