amazing grace my chains are gone chords

There is this this chords which one of my friend wanted to learn but did not know from where to learn. So we both started looking for the reliable source from where he could learn his favorite chords- amazing grace my chains are gone. And we are still looking for the one. Though some of our friends have suggested some links. Let us see what happens. Hope he will learn that chord and he also wants that without costing any penny.