easy when you come over maqta bridge ignore the first turn towards east coast road/al salam st, take the next one, the mosque is on your left hand side after taking the turn you will go back over the main road, and the entrance is on the right.
or you can go over maqta bridge, at the first traffic lights, do a uturn, come back up the road, and the mosque is on right hand side parking/entrance there on right hand side.