Sieve icing sugar in a bowl.

Add to it butter and stir until it mixes well forming a paste

Separate some into another bowl and add to it colour of your choice spread

Spread on the cake then heat milk to help you make it smooth by dipping the knife into the hot milk then level with it.put the

Put the coloured butter cream into a pipping bag, use a nozzle of your choice to make boarders...