Click the Green Flag to Begin. Use your mouse to select your commands. As of now, you can only Fire Phasers, Fire Torpedoes (when available), and change your Target Lock. Using the cross-hair sections in the top right portion of the screen, select which section of the enemy ship you wish to target. There are 5 options: Weapons, Engines, Impulse, Sensors. The fifth option is the center icon, designating no fixed target lock.
Lets you see damage to the Klingons and yourself.