iPod touch
How do I update my iPod touch 4th gen it now has iOS 6.1.1
iPod Touch (4th Gen)
I believe that it is: Settings > General > Software update or something close to that in iOS 6. But note that you will not be able to update a 4th generation iPod past iOS 6.1.6. (It would be useful to do so, as there are security updates in 6.1.6).