How do I update my iPod 5th gen from 9 to10 or more

You cannot. A 5th Generation iPod cannot be updated beyond iOS 9.3.5

Hi , how do I upgrade my iPod 4th generation from 6.1.6 version to a iOS 9.3.5

thanks

You also cannot. iOS 6.1.6 is as far as a 4th gen iPod Touch can update.

but my is a ipod 4th generation

That iPod is too old to run anything beyond iOS 9.3.5

Hi , how do I upgrade my iPod 4th generation from 6.1.6 version to a iOS 9.3.5

thanks