More Pattern Help Needed

I am starting a shawl, and the pattern says to chain 6 with scrap yarn then pick up and knit 3 stitches. Then I am supposed to knit 18 rows. I have that much.
It says on the next row to K3, pick up and knit 1 st in each of the 9 garter ridges along selvedge edge of piece, unzip scrap yarn chain to expose 3 sts at base of the piece, place these 3 sts onto left needle, K3 (15 stitches total)
After I knit 3, where exactly do I pick up and knit the stitches?

You will have a 3 st garter strip that’s 18 rows long; at the end of the last k3, pick up the sts down the long edge just below the tip of the needle. There will be a ‘valley’ between the purl bumps on the edge. After you have 9 sts there, knit into the cast on stitches.

Thank you!! I was making it harder than it was :slight_smile: