It doesn't matter whether it's called icing a cake or frosting a cake these step by step photos will help you make a great one.
Once the cake is cool and the icing made, it's time to cover your cake plate. Use either wax or parchment paper around the edges of your cake plate. Once the cake is iced, just remove the paper and your cake plate edges will be clean.
Basic Cake Making
How to Make Buttercream Icing
Frosting and Icing Recipes