Hi and welcome to KH. It helps if we know what you're making and if you can link to the pattern, that's even better. I looks like you want to work the 1st stitch, work your decrease, continue to the last 3 stitches, work your decrease, work the last stitch. By working your decrease in a stitch from the edge you'll get a much nicer looking edge and if you need to seam it or pick up stitches it's much, much easier. HTH
This is the last time I'm frogging this project for the last time.