IPhone can't be used because it requires iTunes version 10.6.3 or later. Go to?

This keeps popping up in my itunes, what does it mean and how can I get rid of it? The iPhone can't be used because it requires iTunes version 10.6.3 or later. Go to www.itunes.com to download the latest version of iTunes.

I tried going to itunes.com on my phone to download it but there's no download button on there.

Did you go here
http://www.apple.com/.../download/

try from a computer

You need to download the latest version of itunes on your computer buddy not your phone.