SINGER CG-590-WORKBOOK COMMERCIAL GRADE - Manual (Page 23)

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Turn Pattern Selection knob to Step One of the Four-Step buttonhole.
Sew, and the machine will stitch the right side of the buttonhole.
Stop sewing when the needle reaches the fabric mark which indicates
the bottom of the buttonhole.
Turn Pattern Selection knob to Step Two of the Four-Step buttonhole.
Sew 5 to 6 stitches, bartacking the bottom of the buttonhole.
Turn Pattern Selection knob to Step Three of the Four-Step buttonhole.
Sew, and the machine will stitch in reverse, making the left side of the
buttonhole.
Stop sewing when the needle reaches the fabric mark which indicates
the top of the buttonhole.
Turn Pattern Selection knob to Step Four of the Four-Step buttonhole.
Sew 5 to 6 stitches, bartacking the top of the buttonhole.
Cut open buttonhole and use a liquid fray preventer to reinforce the
buttonhole.