I am having trouble getting thunderbolt to work between my macbook pro and imac

I am trying ot set up thunderbolt on my labtop and desktop. I plugged both into the thunderbolt as well as a power sorce but neither seem to recognise the Thunderbolt. I looked up a totorial that said I should go to system preferences and displays and change the Arragement but my display only has display and color. I've updated both and have OS X Lion 10.7.5 on both. I feel like it's got to be something simple I'm over looking.