Cut the watermelon in thin slices about 1/2 inch thick. Then use the star cookie cutter to make the stars. Take a popsicle stick and place it into the center of the bottom of the star, then place it into the popsicle form. The star helps to hold the stick in straight. Slowly pour the lemonade into the container making sure it flows to the bottom of the popsicle form, then top off with the blueberries. Freeze and serve...so simple!