Turn is just what you always do when you get to the end of a row. Take the needle with the stitches from your right hand to your left hand and knit or purl the sts. This time you're only working 19stitches and then turning to work back on those same 19sts. Don't worry about the other 20sts (putting them on a stitch holder or some scrap yarn will keep them out of your way). You'll get to them later. Right now you're working on one side of the shoulder and neck.
You really are making progress!