are you going to pour it or spread it?to pour it. i have never done it before, but i have read that you should take some gananche that is spreadable to fill in any holes or indent. then put your cake on a wire rack on top of a cookie sheet and start pouring from the centre. i think that there are some good youtube videos.to spread it, just wait until it cools and thickens, then spread it like any other frosting. ganache is yummy!