Orbital fleet control is from the Planetary Defense tech, or one along that line.
To get the ships in orbit out of orbit, just click on the planet, click the ship's icon, and click Launch Ship. OR, double click it. OR right right click the blue icon on the right hand of the screen that appears after a new ship is built. Unless you mean how you get enemy ships out, in which case you just attack the planet with a ship that has some attack ability.
