How can I make cake frosting smooth?

To make cake frosting smooth, you can start by ensuring that your frosting is at the right consistency. If it's too thick, you can add a small amount of milk or cream to thin it out. Using a spatula or offset spatula, spread the frosting evenly over the cake in a thin layer. Then, use a bench scraper or a cake smoother to gently smooth out the frosting, working from the top down and rotating the cake as needed. Repeat this process until the frosting is smooth and even.