To Become Good - once you become king press start. Go to your trophy room and in front of your money will be a book. Click on it. Then transact your money (all would work better) to your kingdoms treasury and you will instintly become good.

To Become Evil - once you become king press start and go to your trophy room. Then there will be a book in front of your money click it. Then transact your kingdom's money in to your personal money and you will become instantly evil.