Iveco Eurocargo: Set parking brake

Hello! I was at the TÜV today with my 2006 Eurocargo. Unfortunately I did not get the HU badge, because the parking brake is one-sided (and probably due to the upcoming speedometer test). Now I wanted to ask how to adjust it? I tried it already, but the brake still looks the same as before. Do you need any special accessories or should you go to Iveco right away. Greeting Denis