You can watch it live online , but you need pay for it , the cheapest way to NFL is on ScreenVariety , I really recommend this source , so go on and get it 

I don’t know how to watch it absolutely free, However You can take subscription on ScreenVariety for $29/yearly if you want to watch games HD

I don’t know how to watch nfl absolutely free, but on ScreenVariety you can buy access to cheap hd Tv with NFL Network