How to update itunes on my iphone?

I'm trying to sync my phone with my computer for iTunes, but when i plug it in, it tells me this iPhone can't be synced without iTunes 11.1 I have already tried the website on my phone and computer, and iTunes itself on both devices. But i can't find a way to download it on my phone and its driving me nuts. Someone help me. Lol

Its not talking about the iTunes on your iPhone its talking about the one on your computer… So go to the website, download the latest version and then it will work!

You don't need to update the itunes on your iphone
just go ahead to itunes' website, and install it again
http://www.apple.com/.../download/

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