Hold both strands to make a knot close to the towel and trim the ends.

Knot your new thread and insert it close to your recent stitch, coming back through.

Put your needle under the line of thread you just recently stitched to the right, pulling your thread almost all of the way through.

Put your needle under the thread from your current stitch.

Like in the third picture, you will want to pull the loop at the top until you have a flat line across.

Pull your thread all of the way through to make it stay.

Go back through your initial hole towards the back, then come up through to the front on the other side of your current stitch.