Fulfillment by Amazon (FBA) is a service we offer sellers that lets them store their products in Amazon's fulfillment centers, and we directly pack, ship, and provide customer service for these products. Something we hope you'll especially enjoy: FBA items qualify for FREE Shipping and Amazon Prime.If you're a seller, Fulfillment by Amazon can help you grow your business. Learn more about the program. Start the game and click Settings - Control - Customize. Move the AIM to the upper left corner. Move the Fire button to the top right corner. [You can adjust these according to your own habits. ] Adjust the shooting and target buttons under the touchpad of the mobile game controller . Save your settings.