Where Is Reverse On Audi Stck Shift Reversing Light Probs On Audi 80?

Reversing light probs on Audi 80? - where is reverse on audi stck shift

I f 1989 (REG) Audi 80 and the rear lights when they come to do the opposite! I checked the bulbs, then I also think I need to change that, but nobody knows where he is and how it is accessible? I have a Haynes manual does not tell you where you are and how to access them! Thank you in advance.