the f# is
x
3 What is this note?
4 What is this note?
4here right?
2
x
G major scale:
G - A - B - C - D - E - F#
The Bm is made from the above scale. Starting with the B, skipping note C, including the D, skipping the E, and finally using the F#. So we have made a triad chord (three note chord) using notes from the G major scale and they are:
B - D - F# = Bm chord
What is really cool is that you can now find all the locations on the guitar neck where the above three notes are found and then you can play a Bm chord. Become familiar with the octave patterns, add some octaves and widen out your fingerings. It's fun to do this and I am realizing more and more that memorizing and knowing the notes that make up a chord really is a must.
Bill C