Cast on 21 sts and knit 1 row. Commence from chart.
Replace row 12 in the instructions with the following:
Row 12: Slip 1, k1, pass both sts back onto the right hand needle, pass the second stitch over the first, slip the remaining st back to the left hand needle. Continue knitting 1 and passing it over the st on the left hand needle 5 more times, k4, yo, p2tog, k3, drop 1, k7, yo, p2tog, k2.
Shown with a cast-on count of 21 stitches.