Every fingering that fits a hand
70464x
hard
x2122x
hard · no 5
70764x
hard · no 5
797879
hard · barre
7676xx
hard · no 5
What is true of it
B9 is B, D♯, F♯, A and C♯ — 1, 3, 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 70464x: 4 fingers, held at the 4th 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.
1 of the 5 need a barre.
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
B9/D♯
x64605
B9/F♯
20122x
B9/A
x01222
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.