Hello @BirgitP
6/8 on a metronome can cause confusion.
In 6/8 there are two main pulses, on beats 1 and 4.
1, 2, 3, 4, 5, 6
Each of these six beats is an eighth.
two eighths = a quarter
three eighths = a dotted quarter
A dotted against a note / beat extends its duration by half again.
If the tempo is given as 94bpm, you need to know if this is the bpm for quarter notes.
That would mean a tempo of 188bpm if considering eighths.
Divide that by three to get the tempo for the dotted quarter (between 62 and 63 bpm).
Try the metronome at 62 or 63 (for two beats per bar).
I hope that helps.
Cheers 
| Richard_close2u | JustinGuitar Moderator, Guide & Approved Teacher