Singer Quantum Decor User Manual page 11

Turn Pattern Selection knob to Step Two of the Four-Step buttonhole.
Sew, and the machine will stitch in reverse, making left side of the
buttonhole.
Stop sewing when the needle reaches the fabric mark indicating the top
of the buttonhole.
Turn Pattern Selection knob to Step Three, the upper/top bartack.
Sew 5 to 6 stitches.
Turn Pattern Selection knob to Step Four, to form the right side of the
buttonhole.
Sew, the machine will stitch forward, making the final side of the
buttonhole.
Stop sewing when the needle reaches the bottom of the buttonhole,
indicated by the mark on the fabric.
Cut open buttonhole and use a seam sealant to reinforce the buttonhole.
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