To play the Bsus chord, perform a barre by pressing your index finger on the E-string and bottom-A string on the 2nd fret, ring finger on the 4th fret of the top g-string, and little finger on the 4th fret of the C-string.
The Bsus chord contains the notes B-E-F#.
In this case, the "sus" in the chord name, which means suspended is referring to a "sus4" note.
To build a Bsus chord, take the suspended fourth chord formula (1-4-5) and apply it to the B major scale (B, C#, D#, E, F#, G#, A#).
Identify the first, fourth, and fifth scale degrees in the B major scale which are B-E-F#, which gives you a Bsus chord.
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