These directional signal units are sure to toy with your mind.
First you must decide what you will use for the lights. If you have the two lights that mount on your front fenders they are excellent for the front turn signals.
It is easier if you install two lights in the rear dedicated to the signal lights.
Locate the wire in the signal unit that is marked LF. Tie that wire to an extension wire from the LF top fender light. Now locate the RF wire and extend it to the RF top fender light.
Locate the LR wire and extend it to the the LR light you have installed. Locate the RR wire and extend it to the RR light you have installed.
Follow the instructions as to the hot wire and the signal light on the directional unit.
All of these wires must be independent of the normal wiring harness on your car.