The chord Am7b5 that is shown here contains the notes: A, Eb, G, C. The root of the chord is A. The scale from which the chord is derived is Half-diminished chord (1–♭3–♭5–♭7), and the degrees of the scale are: 1, ♭3, ♭5, ♭7.
To play the chord Am7b5 shown above, place your fingers as follows:
On string number 5, on fret number 0 (open string)
On string number 4, on fret number 1 with finger number 1 (index finger)
On string number 3, on fret number 0 (open string)
On string number 2, on fret number 1 with finger number 2 (middle finger)
Start strumming from string number 5 (notice not to play strings 1 and 6).