How I make French knots:
Pull the needle up through the top of the fabric.
Wrap the tail of your thread around the needle 1, 2 or 3 times. I used 3 wraps for my block border and center of each daisy.
Reinsert the needle back into the fabric close to, but not in the same hole as, the protruding thread.
Hold the tail of the thread firm but not tight as you pull the needle through.
Hold the bottom thread as the top thread goes through. (I let go of the thread so you could see what the process looked like.)
Give a gentle tug and you are done.