[header] How to pipe frosting on cupcakes [title] Choose a tip. [step] Pastry bags typically come with a set of tips that you can switch out to make different designs with your frosting. Pick a tip that looks appealing to you. 
Common designs are circles, stars, dots, and other simple shapes, though more complicated tips are also available. [substeps] Choose the smallest tip you can for the design you are trying to pipe.