Have trouble with creating a function

Hi, I am stuck on this question and could use some advice.

The question goes like this: Create a function named square. It should define a single parameter named number. In the body of the function, return the square of the value that was passed in.

Which I did easily as this

def square(number): return number * number

But then the second part goes like this

Great now that you have created your new square method, let's put it to use. Under the function definition, call your new function and pass it the argument 3. Since your square function returns a value, create a new variable named result to store the value from the function call.

I am really unsure about what to do and have tried many things, can somebody please explain? :/