Without knowing the pattern at all, this is what it sounds like:
Let's pretend you had 20 rows that you knit beyond that marker. You are now going to drop the stitches, letting them "ladder" down, down those 20 rows. When you get to that point, now take a crochet hook and catch them back up to the top again-- it's as if you're fixing a dropped stitch-- BUT you're going to do it 2 strands at a time, so you'll catch 2 strands of the ladders, and so 2 X 10 = 20, you'll do it 10 times. This will scrunch up your fabric. Does that make sense when you look at the photo of the final outcome? Where did you get the pattern? Can you provide a link to it, or if it's in a book or magazine, tell us the name and page number?