After you finish the last row of the instep, break the yarn. If the instep sts are on the right needle, just slip them back to the left needle (you can do this by putting the tips of the right and left needles tip-to-tip and sliding the sts across). Pick up the 7sts along the right side of the instep (there should be about 14 rows along the instep so pick up a st ~every other row), knit 11sts across the instep and pick up 7sts down the left side. Then knit across the remaining sts on the left needle These are the ones that have been waiting while you knit the instep. Now you're going to knit all the sts from one end to the other for 9 rows. If your st count is off (12sts instead of 11sts on the ends) it should still be ok or you could adjust the numbers now by knitting two together somewhere along these sets of 12sts.
GG, thanks for the pattern link!