Welcome to RU Lanny! I'm sure you will enjoy it here.
Assuming you have a controller that is recognized by Windows, when the game is up press the TAB key and you will get a menu where you can select to configure controls.
Just go into the controls menu and select the command you want to change, press the Enter key and then press the button or direction on your control pad you want to use instead. Repeat that for all commands and then you should be able to use your controller with the game.
Hope that helps.