To change the base/frosting/topping, press the white box next to it. To change the plate just click on it click the green button to go to the next step click the timer/cakes eaten/cakes sold to shrink it or enlarge it
After making the cake you can either sell it or eat it. Eating the cake give +5 cash but selling it gives you +20 You lose 5 cash every 70 seconds It takes 5 seconds for the title screen to go away and to cook the cake