How to put my own music on my iPhone 3GS?

I have no idea how to this when connecting my computer to my iPhone and going through iTunes. I want to put my own music off my computer not buy it through iTunes

Drag and drop mp3
my computer -> iphone -> music

Heres a tutorial on how to do it

It's easy.

Connect iPhone to iTunes
You'd see iPhone pop up in the top right, click that
Then Music and set it up
Then sync

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