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
Denial, anger, bargaining, depression, acceptance...the five stages of frogging.