I just received a 3 light Westcott Stroblite kit and was wondering how to get the two lights not plugged into the camera to fire. I plugged the cord into the camera then into the back of the light in the sync plug and it fires. I was told that since the other two lights have cells that they would also fire when the first light did. Unfortunately the only light that fires is the one with the camera plugged in. I bought the kit used so there were no directions with it. Any help would be appreciated. Thanks.