This sewing machine looks exactly like the Berninas that I own, although my are not industrial. You just use the dial to make each side of the buttonhole, only having to set the stitch length to super small. The way you make buttonholes is this:
Think of the buttonhole as a square-ish capital O, with the center of the bottom of the O as the point where the button shank will lie when buttoned. Place the marked buttonhole area under the buttonhole foot, with this bottom point directly under the foot, squarely in the center of the 'hole'.
-Turn the dial to 1 and the long left edge will sew in zig zag stitches; stop the machine at the top of the O.
-Then turn the dial to 2 and the top edge of the O will sew; stop the machine after half a dozen stitches.
-Turn the dial to 3 and the right edge will sew; stop the machine at the bottom of the O.
-Turn the dial to 4 and the bottom edge of the O will sew; stop the machine after half a doze stitches.
-Turn the dial to 5 and run half a dozen stitches; this is a line of straight stitches that will 'tie off' the buttonhole.
Try this with a plain piece of fabric. Just put the fabric under the foot and dial away. You'll see how the stitches stitch.
I'll send a copy of instructions from my manual to you if you want. Email me at: [email protected]