The method that was described above, using a straight stitch, is a better way to go than the knotting function. It looks much smoother. When I use the knotting function, I can easily see where I've started and stopped. When I use the straight stitch combined with the blanket stitch, it's smooth as can be, and a second person would be hard-pressed to find the beginning and ending. It's a much better way to go.
I'm not sure how your machine works. On my machine, I simply press one for the straight stitch, and then 45 for the blanket stitch. It's no more difficult that pressing the button for the knot at the beginning and end.