I am new to the accordion and was playing The god father waltz and I came across these note and I have no idea how to play it
As this is a chord, I'm assuming that the chord is on the bass clef. (If not, could your post a picture with more context?)
The accordion convention is that bass notes represent major chords. Thus, as the note is a D, it represents some type of D chord on the bass side. The small "m" indicates a minor chord. So, you play the D-minor chord.
Additional accordion information: The usual Stradella layout has 6 bass buttons for each note; the notes are arranged by the circle of fifths. The second button from the bottom (at least I think it's the bottom) is the root note. The 3 note at the bottom is a major third above that root (allows for a walking bass and the like); the next row are 3-note major chords, then 3-note minor chords, then 3-note dominant seventh (fifth missing which allows for Augmented Sixths), then 3-note diminished seventh missing the fifth. https://accordionchords.com/stradella-bass-layouts/120-bass-accordion-chart/