|Sample knit with Caron Simply Soft on US size 7 needles|
The pattern calls for "plus 2" stitches - one to be knit on each edge. If using this stitch alone in your pattern, I would add a few more to make a wider border, because the edges look a little sloppy to me. If you are a tight knitter, try to loosen up a bit, or use a larger needle so the 'knit 3 together' will be a bit easier on you.
Cast on a multiple of 5 stitches plus 2
Row 1: K1, *K2, YO, K3tog, YO*, repeat from * to end, Knit last stitch
Row 2: K1, *P3, K2*, repeat from * to end, Knit last stitch
Row 3: K1, *P2, K3*, repeat from * to end, Knit last stitch
Repeat these three rows for pattern.
And here is the video. Enjoy!