You should find TWO screw terminals on the front of the coil. One is for the hot (black w/white stripe), the other is for the ground lead (blue or yellow) from the ignition. Orientation does not matter here, there is no polarity to the coils.
There are no connections to the grounding/mounting bar, although mounting the harness ground (green) at this location should not cause a problem, although the harness ground is typically attached at the coil bracket frame bolt.