In this tutorial, we learn how to install a zipper into your knit. The first way you can do this is to take it to a tailor and they will do it for around $15. To do this by hand, grab your piece that needs a zipper and then steam the edges. After this, take a sewing needle and start to sew the zipper underneath both sides of the edges of the piece. You can also use pins to place into these so it stays in place. Do a backstitch also, to help make the zipper more sturdy and stay on longer.