Got it into the dealer today. They installed a 3rd party alarm, not a ford one, which is ok with me. The antenna/button/light is part of the alarm, the blue light was flashing all the time due to a bad wire during install. They fixed the wiring, checked all connections and reprogramed the unit. The blue light is only supposed to come on when alarmed or in valet mode. The button is used for multiple systems. It can be used as an override button for going into and out of vlaet mode. If I had the disply fobs (which the edge does not have) a person could be in the car and press call and talk to the person with the display key fob.
Sorry to get everyone worked up, the dealer apologized for the mistake on the install and no documentation. Got a tank of gas for my time.
Bill