HOW DO I GET MORE IOS...MY VERSION IS 6.1.6

Your iPod Touch 4th generation is nearly 5 years old and cannot be upgraded past iOS 6.1.6.

If you want/need the newest iOS with the newest features you will need to purchase the latest iPod Touch 6th generation.

Good Luck to You!

The fourth generation iPod Touch can not be upgraded further.

If you need to run a newer version of iOS then you need newer hardware that can execute it.