This video will show you how to remove the Rear Light (Tail Light) from your Audi A4, S4 or RS4 (B6 and B7).
This is performed on a B6 Saloon (Sedan), but the B6 avant and cabriolet is very similar (as is the B7 Avant, Saloon/Sedan and cabriolet) and so this video can be used as the basis to remove the rear tail light from all models.
Looking for tools? https://www.amazon.co.uk/shop/totaltechnik
Video by TOTAL TECHNIK.