The below diagrams show you how to play the C major 6 chord in various positions on the fretboard with suggested finger positions.
Interval positions with respect to the C major scale, notes in the chord and name variations:
Note: Major six chords share the same notes as their relative minor seven counterpart. I.e.. The relative minor of C is A so CM6 shares the same notes as Amin7.
All-in-one Guitar Course With a Proven Step-by-step Learning System at Udemy