How to install the Gamepad?

1: Find and open the Setup panel in the Game interface 2: Click on User-defined operation setup 3: Set up the use-defined firing key,and save it. Note: If one Gamepad can't work,you can move the position of the corresponding button in the game, then close the screen and reopen the screen. Note again: This game pad have size limits for mobile phones which width cannot not over 1cm.