Every fingering that fits a hand
x20222
moderate
x2022x
open · no 5
740405
moderate · no 5
740605
moderate · no 5
740705
moderate · no 5
What is true of it
Bm9 is B, D, F♯, A and C♯ — 1, b3, 5, b7 and 9 counted from B.
On an instrument that cannot reach all 5, the 5 and 1 go first, in that order.
The easiest of the 5 fingerings below is x20222: 4 fingers, held at the 2nd fret.
1 of them use open strings, which is what makes a shape quiet to change to.
1 string stays silent.
Where its notes are on the neck
The brass dots are B, the root. Everything else is a chord tone with its degree printed in it.
With a different note underneath
Bm9/D
xx0222
Bm9/F♯
200222
Bm9/A
x00222
An inversion is the same chord with a different note lowest. The name changes to a slash name because the bass is what a listener hears as the foundation.