I melt some colored choc. melts, spread the melted chocolate thin on parchment and then cut out the size I want with the end of a pastry tip and attach them to the cake using the BC frosting if I have to.
Your best bet since time is short is to check out www.wilton.com. It is Wilton's website and it has a link to tutorials that walk you through it with photos. Basically, you pipe a little blob, stop squeezing the bag, then pull the tip around and away to the side - not straight up. The pics on Wilton's site will show you what I'm talking about. Good Luck and have fun! I love the look of dots on cake!
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