Instead of knitting row 5, purl it. That will put a purl ridge on the knit side, which will probably be used for a turning ridge for a hem. So your rows will be k, p, k, p, p, p, k, p, etc.
Though they may be assuming that you start with a purl row for the stockinette, so you would then p, k, p, k, k, k, p.
It's not written well, the main thing is to get 4 rows of stockinette, then make sure a purl ridge shows up on the RS.