This chord is found by locating the 1,(b3), 5 and 6 positions of the F Major Scale: F, G, A, Bflat, C, D, E . That little “b3” simply means a flattened third. You are taking the 3 step in the F Major scale (A) and lowering it by a half step to an Ab.
Notes of the F Minor 6 chord are: F, Ab, C and D
Like most chords, there is more than one way to play the Fm6 chord. Listed below in the chord chart diagram is the F Minor 6th chord played on the first fret.
Here is a key that will help you read the chart: