Select the number of players, then you may see the controls for each player. You may also change each player's name and their main color. Once the game starts, press the corresponding fire keys and arrow keys to control the tanks and kill other players. Collect powerups by driving over them to gain advantages in battle.
On PC, the player controls are shown before the game starts. On mobile, move the joystick to move your tank, and fire with the button.
Open the pause menu, (Can be accessed pre game and in game) select controls, and click the button you want to change. Then, press the key you want to change it to.