Show me how you would switch on the rear fog light(s) and explain when you would use it/them. (No need to exit vehicle)
Operate switch (turn on dipped headlights and ignition if necessary). Check warning light is on. Explain use.
Power the car up.
Turn headlights to dipped.
Turn on the fog lights from the centre console
Explain that you would only use the fog lights when visability is under 100 metres.
Never use the fog lights unless they are necessary and also be courtious to other road users.