I think there may be a typo on row 3 about slipping the st with the yarn in front; it's a purl row and that would leave the strand of yarn across the WS. Row 6 is a RS row and you need to pick up that strand which would be impossible since it's on the other side. Slip the st on row 3 with the yarn in back
, and that would leave the strand on the RS so you can pick it up on row 6.
This one isn't listed, but there's a page of corrections
for this issue if you're wanting to make other patterns from it.