Hello, I am knitting a sweater with a cowl neck. The pattern states that I make the cowl separate and attach later. The problem I have is the neck opening. I have done the first row binding off the correct amount of stitches. The second row says “purl to neck opening, using a cable cast on, cast on 21 sts, purl to end” I would appreciate some help with this. When I did the cast on, the yarn was on the wrong side from where I need to purl to end. Not sure what I did wrong.