How to put mp3 music on my iphone 4s?

I've tried doing it through itunes but nothing happens I click on iphone then click music and when i press sync it says "are you sure you want to remove existing music.films and tv programmes books and tones from this iphone and sync with itunes library" so does that mean if I click "sync and remove" then it will remove all my music already on my iphone! Help!

Added (1). Then how do i do it manually?

"How do I put mp3 music on my iphone 4s?"

The same way you put any music on any iOS device.

"so does that mean if I click "sync and remove" then it will remove all my music already on my iphone?"

You realize that you don;t have to sync to put music on iOS device like an iPhone, right? You know you can just set for manual management and just drag and drop the songs onto the iPhone, right?

There are some idiots who insist that you could only do this for older players like the iPod 4 or the iPhone 4 and 4s not having the latest iOS version. That's clearly wrong - I've put music on my daughter's iPhone 5 using iTunes 11.

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