The chord Abadd9 that is shown here contains the notes: Bb, Ab, C. The root of the chord is Ab (The lowest sound - the bass - is AB). The scale from which the chord is derived is Major add9 chord (1โ3โ5โ9), and the degrees of the scale are: 1, 3, 5, 9.
To play the chord Abadd9 shown above, place your fingers as follows:
On string number 4 (the thickest), on fret number 3 with finger number 1 (index finger)
On string number 3, on fret number 3 with finger number 1 (index finger)
On string number 2, on fret number 4 with finger number 2 (middle finger)
On string number 1 (the thinnest), on fret number 3 with finger number 1 (index finger)
Finger numer 1 presses multiple strings as a barre.