The chord Asus4 that is shown here contains the notes: A, D, E. The root of the chord is A. The scale from which the chord is derived is Suspended fourth chord (1–4–5), and the degrees of the scale are: 1, 4, 5.
To play the chord Asus4 shown above, place your fingers as follows:
On string number 4 (the thickest), on fret number 2 with finger number 2 (middle finger)
On string number 3, on fret number 2 with finger number 3 (ring finger)
On string number 2, on fret number 0 (open string)
On string number 1 (the thinnest), on fret number 0 (open string)