Every fingering that fits a hand
4220
easy
4250
easy · no 5
4655
moderate
4252
hard · no 5
4255
hard · no 5
What is true of it
Bm7 is B, D, F♯ and A — 1, b3, 5 and b7 counted from B.
These are also the notes of D6/B. Which name is right depends on what is underneath and what came before — the notes alone do not decide.
On an instrument that cannot reach all 4, the 5 goes first, in that order.
The easiest of the 5 fingerings below is 4220: 3 fingers, held at the 2nd fret.
None of them uses an open string, so this chord moves up the neck unchanged — the same shape 1 fret higher is the chord a semitone above.
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
Bm7/D
7979
Bm7/F♯
bbac
Bm7/A
2222
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.