The flap that you knit is the top of the foot.
You'll need to slip the stitches that are on your right needle over to the left one and then, using a new strand of yarn, knit across those nine stitches.
Then you pick up stitches along side one, knit across side 2 and pick up stitches down along side 3, and knit the rest of the stitches that are on the left needle.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry