If I have an mp3 song on my computer, how do I get it onto my iPhone? - 1

If I have an mp3 song on my computer, how do I get it onto my iPhone?

Added (1). I need details on how to do this.
I have asked this before and people say things like "copy it over" or "sync it with your itunes". That doesn't help. How do I copy it over. I do not have itunes, at least not that I know of.

Added (2). Jackson, I do not mean to be rude but the question is "HOW?"

Hay man why don't you try using a USB cable to copy your music… Works for me trust me

Download iTunes
Sync using that. Go over the instructions properly.
Done.

Very easy.

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