How do you give commands to Skeletons for the Necromancer

The Command Skeletons and Command Golem skills both have and Active and a Passive ability. I cannot figure out how to activate the Active ability to command the Skeletons or the Golem to attack a specific target. Can someone please explain this to me? Tried googling of course but couldn't find anything. via /r/diablo3 http://ift.tt/2u2jtaI