Here are the steps to frost a cake:

1. Start with a clean and level cake surface.
2. Apply a crumb coat (thin layer of frosting) to seal in any loose crumbs.
3. Spread the frosting onto the cake, starting with the top and then moving to the sides.
4. Smooth out the frosting using an offset spatula or cake scraper.

Here is a video tutorial that you might find helpful: [Cake Decorating for Beginners | How to Frost a Cake](https://www.youtube.com/watch?v=zk_OYb0NKKk).