After your cakes have thoroughly cooled, you get to destroy them. Put it in a bowl and with a wooden spoon crush it up until its nice and loose. Then add in the icing. I found that you need about one can of icing for a whole cake, maybe a little more or a little less depending on the type of cake. Then using your hands make the cake/icing mix into balls, about the size of a ping-pong ball. Then stick them in the fridge to stiffen.