Follow the directions on your box/ recipe and mix together the cake. We separated ours into two 8 inch round pans for this cake, but you can make any size or shape you want. A good tip is to place the bottom of the pan on parchment paper and draw out the shape of it, then cut this out. Grease the pan as usual, and place the parchment cut out on the bottom of the pan. Then grease the paper and pour the cake batter over it. Basically this guarantees that the cake will come out of the pan much more easily than normal.
Cut the cake to shape and cover it with a layer of frosting. The frosting will act as a glue and will hold the fondant onto the cake.