On the cake decorating turntable, if using, place an 8 inch cardboard round (if using), then place a 6 inch round (if using) on top of that. Tape the 6 in to the 8 inch round is also advised. If not using any of the above just place on what you are wanting to serve the cake on, but remember it has to fit in the freezer for a little while!
Add a spoonful of frosting to the center of the 6 inch round (or cake serving plate) and place your bottom cake layer on top, centered on the 6 inch cardboard round.
Add a nice layer of buttercream on top of the bottom layer, spreading it out to the edges. Place your top layer on top of that.
Add a crumb coat layer of frosting over the entire cake. A crumb coat layer is a thin layer of frosting that helps keep all the crumbs stuck to the cake and allows you to frost the cake really nicely later on. The crumb coat is not supposed to be pretty!
Stick your crumb coated cake in the freezer for 10 minutes. While that is in the freezer, frost your next 2 layer cake and stick in that freezer.
After 10 minutes, remove the cake and frost with the final layer of frosting, making it nice and smooth. I like using an icing scrapper.
Then using a Wilton 2M piping tip and piping bag, pipe on the colored rim. Then stick the cake back in the freezer for 10 minutes, and frost the 2nd cake.
Pull the cakes out of the freezer. Then using cake decorating paint brushes (found in the cake decorating isle of a craft store!) and the gel food coloring, paint on the StarCraft Designs.
Light the candles, slice, and enjoy!