To play the Gbsus chord, place the little finger on the 3rd fret of the top g-string, index finger on the 1st fret of the C-string, middle finger on the 2nd fret of the E-string, and ring finger on the 2nd fret of the bottom A-string.
The F#sus chord (also known as the Gbsus chord) contains the notes F#-B-C#.
In this case, the "sus" in the chord name, which means suspended is referring to a "sus4" note.
To build an F#sus chord, take the suspended fourth chord formula (1-4-5) and apply it to the F# major scale (F#, G#, A#, B, C#, D#, E#).
Identify the first, fourth, and fifth scale degrees in the F# major scale which are F#-B-C#, which gives you an F#sus chord.
Note: In the F# major scale a sharp is added to E. On the piano, there are no black "sharp" keys, but music theory rules dictate that each scale degree be represented by a different letter, which is the reason we identify the seventh scale degree as E#. The enharmonic equivalent of E# is F (that is to say, E# = F).
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