k1, (knit, purl, knit) all in yo, rep from
-- In the previous row you made a yarn over stitch. On this row, in that stitch you are going to work three stitches. Knit, but don't slide it off, bring the yarn forward between the needles and purl into the same stitch without sliding it off, and then bring the yarn back and knit into it again, finally sliding it off.
After you do the first section, you'll pick up and knit
stitches along the edge to make the next section.