To play the game you first place your ships around the grid. To do this you need to select a ship and then the square you want it to move to. You can rotate each ship and randomly place them by using the buttons.
When you start playing the game you need to press one of the squares on the other players grid where you want to fire a rocket towards. If you hit a ship you can keep taking another shot until you miss and then it will be the other players turn. If you hit all parts of a ship then that ship will become visible to you.