How-to Pipe Meringue onto Cookies
Insert a decorating tip that has a large opening into a pastry bag or heavy resealable plastic bag. (If using a plastic bag, first cut a small hole in the corner of the bag.)
Fill the bag about half full with meringue. Smooth the meringue down toward the decorating tip to remove any air bubbles that could cause breaks in the design when piping. Twist the top of the bag shut.
Line a baking sheet with parchment paper. Hold the pastry bag straight up and position and tip about 1/8 to 1/4 in. above the baking sheet. Hold the tip with one hand and squeeze the pastry bag with other. Stop squeeze before you lift up the decorating tip.