The trick is understanding the flow of data. You need storage locations (variables) to hold the two numbers, an input mechanism to get values from the user, and an operation to combine them.
Think of variables as labeled boxes where you store numbers. When you read input, you're filling those boxes. When you compute the sum, you're creating a new box with the combined value.
You don't need any advanced techniques here. Just declare two int variables, use cin to read them, add them together, and print the result. The simplicity is the point - this problem teaches the basics.