Instructions
Log into your Facebook account and click ̶0;Account̶1; in the upper right menu.
Click ̶0;Account Settings̶1; and then click ̶0;Payments̶1; in the side panel. Click ̶0;Buy More̶1; next to ̶0;Credits Balance.̶1;
Click the radio button next to the amount of credits you want to buy, and then click ̶0;Buy Now.̶1; If your payment information is stored with your profile, it will be billed to the source listed. If not, you will be prompted to enter your payment information.
Launch the ̶0;CityVille̶1; application and wait for the application to load.
Click the ̶0;Add Coins and Cash̶1; tab. Click the amount of CityVille cash or coins you wish to purchase with your available Facebook credits. Click ̶0;Continue.̶1;
Click the ̶0;Buy̶1; button to complete your purchase. You can now use the cash or coins that you bought with your Facebook credits to purchase items within CityVille.