Working over part of the sts, then wrap and turn is also called knitting short rows and it's used to shape a knitted piece. If you follow the instruction given for it in the pattern step by step it'll work, or there's a video for it near the bottom of the Advanced Techniques page.
To 'rib' 9 or 18, is to work 9 or 18 sts in the rib pattern which is a 2x2 rib wherever you happen to be in it. So Rows 1 and 2 would to rib 9 sts, wrap the next stitch and turn, then work back over those same 9 sts in the rib pattern. On row 3 you work 18 sts in the rib pattern before wrapping and turning. When you come across the st that was wrapped before, knit the wrap with the stitch, which is explained in the video.
sue- knitting heretic