Need Help with converting data types

Need help with one of the lessons on dealing with data types, specifically dealing with trying to convert a string to an int with Convert.ToInt32(). Not sure how I am supposed to get it to run at all!

Link:https://www.codecademy.com/courses/learn-c-sharp/lessons/csharp-data-types-variables/exercises/converting-data-types-csharp

What does your code look like?