How do you get the guide in the locker on wimpy wonderland?

You have to jump up the tree on the right side of the school then you'll get a scrap of paper which says Greg's locker combination, then you go into the school and find Greg's locker (Greg's locker is the locker that doesn't have any blue lines through it) Once you've found the locker you click on it and you swirl round until the numbers are right.