Gather the zipper, fabric pieces, pins or clips, thread, sewing machine or needle, and scissors
Finish the fabric edges if needed
Mark the zipper placement on the fabric
Open the zipper
Place the zipper face down along the marked edge
Align the zipper teeth with the seam line
Pin or clip the zipper in place
Sew one side of the zipper tape to the fabric
Close the zipper
Align and pin the other side of the zipper to the remaining fabric edge
Sew the second side of the zipper tape to the fabric
Sew the rest of the seam below the zipper
Backstitch at the ends for security
Test the zipper to make sure it opens and closes smoothly
Trim loose threads and press the seam flat