1 (1)zip -

: Place the zipper face down on the open seam. Pin it in place so the teeth are centered exactly over the seam line.

Inserting a zipper (often called a "centered" or "standard" zip) is a fundamental sewing skill. Laurens Top Tops recommends this method for cushions, skirts, and dresses as it creates two neat layers of fabric that meet to cover the teeth. 1 (1)zip

: Using a zipper foot on your sewing machine, stitch down one side of the zipper tape. When you reach the bottom, sew across the zipper tail, then turn and sew up the other side. : Place the zipper face down on the open seam

: Flip the fabric over to the right side and use a seam ripper to carefully remove the basting stitches, revealing your functional zipper. Quick Fixes for Common Issues Laurens Top Tops recommends this method for cushions,

While your request could refer to a few different things, I am providing information on the most likely intent: into a piece of fabric.

: If the slider comes off one side, you may need to snip the bottom stop, slide the head back on both tracks, and sew a new "stop" using thread or a safety pin.