Do a google search for attaching binding to a quilt. There are many websites with detailed instructions and videos showing how to to it.
I sew my binding to the top of the quilt, then fold it to the back. I pin it in the ditch making sure that the pin catches the binding on the back, then stitch in the ditch as close to the seam as possible. I think this looks much neater than stitching on the top of the quilt.