Mark - from Honolulu, HI
While holding the bag in one hand, fold down the top with the other hand to form a generous cuff over your hand. After placing your tip, use a spatula to fill the bag just half full with icing. Do not overfill the bag. If you do, icing may squeeze out the wrong end. Remove the icing from the spatula by squeezing the bag with your thumb and fingers against the spatula and pulling the spatula out. Close the bag by unfolding the cuff and twisting the bag closed; this forces the icing down into the bag. "Burp" the bag (release the air trapped in the bag) by squeezing some of the icing out of the tip into the icing bowl just before decorating the cake. "Burp" the bag after each refilling.