How to pipe stars: Use a star tip on your piping bag. Hold the bag straight up with the tip slightly above the surface. Squeeze bag to form a star (the more pressure you place, the bigger the star). Stop squeezing before pulling the tip away. How to pipe rosettes: Hold the bag at a 90º angle with the tip slightly above the surface. Squeeze out frosting as if you're making a star. Without releasing pressure, raise the tip slightly and form a circular motion gradually away from the centerof the star. It's always a good idea to trial on a board or piece of napkin to do your first try!