Line up the far edge of the shorter fold just a little below the raw edge of the 2 pieces of fabric that you are binding together. The center crease is the 2nd fold down and the larger fold is folded up and on the bottom.

Make sure that the wrong sides of your 2 pieces of fabric are facing each other and the top of your shortest fold is just a little down from the raw edge of your fabric. Sew following this fold.

If there is any extra length to the ends of your binding hanging over the ends of your fabric edges, just turn them under and sew while you are sewing down your crease. This will make a nice smooth edge and look professional if you are attaching another piece of fabric for a side seam. Of course I would use a matching thread instead of white but I wanted you to be able to see my line of stitching.

Fold over your binding to the backside (2nd piece) of fabric. You will then see a very clean edge and your stitching will not show. Your longer fold will now be on the backside next to your 2nd piece of fabric.

Sew along the very bottom of your binding on your front fabric. Because the part of the binding that you folded over to the back is bigger, you will catch the 2nd side of the binding in a nice straight line.

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