In order to get a save code, you need to press the little brown gear (Visible when playing the game) and click the ‘Save Game’ option. If you do have a code, then just paste it into the prompt that comes up. If you do not have a save code, then this will be of no use to you.
There are two buttons: ☆ Start Button: Click on this button to start the game ☆ Load Save Button: When you click this button, you will be transported to another screen where you will be asked for your save code. When you first press the green flag, you will be taken to the start screen.