Continue stitching across the edge. This photo shows how I like to hold the fabric I am stitching. Holding the floss in my fingers away from the edge helps keep the floss from becoming tangled as I stitch.
To finish the blanket stitch, space the final stitches so that your last stitch will be the same size as the rest of the stitches. Pull the last stitch up.
Insert your needle under the bar of your first stitch as shown in the photo.
Turn the fabric over so that the back is facing up. Hold the floss away from the edge.
Insert your needle through the back layer of fabric only like you are making another stitch. Make sure the needle comes up between the two fabrics. Hold the floss away and to the left of the needle. Pull floss through fabric and tighten up the stitch.
Turn fabric piece over again. To secure the stitch, insert your needle through the loops forming the last stitch from the bottom right to upper left side (see photo); pass needle through loop to make a knot. Tighten knot.
After you have tightened your knot, take the needle in between the layers and bring up again through the front about one inch away from the edge. Snip floss and make sure the end is hidden between the layers. When you are done, your stitch should look like the photo here. If you look closely, you can spot the final knot, but it is not obvious.