Singer manufactured some White sewing machines. The Singer support site,
https://www.singer.com/support , has the White 793 manual listed as the W666-793. The current link to the manual is
https://www.singer.com/sites/default/files/product_manual/801_white-666-793-x.pdf . Follow the directions for the Creative embroidery to set up an appropriate zigzag stitch. Just ignore the part about patterns (changing the settings every few steps). You will need to use the zigzag presser foot and needle plate. If you are having problems with the stitches skipping, check the needle point for damage (replace with a new needle)and clean the bobbin case.
I hope this helps.
Cindy Wells
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