Can someone please try to explain this to me? I am working on a Nintendo DS Lite sock and I am not sure I understand the end. I know how to do the stockinette slip stitch and the ribbing slip stitch but I don't understand the last 2 sentences, I have underlined below. Well I do understand the last one but not in relation to this project in particular. How does this form a "pocket"; I have no pocket. Also, is this what is considered double-stitching?
Continue working ribbing for one inch, until piece measures 5.75”. Separate sides of the pocket by placing every other stitch onto stitch holder. BO all stitches and weave in ends.
Link to full (free) pattern here