You have to ask Letterboxd, we cannot give support here

Thank you. But Letterboxd says this: “ All film-related metadata used in Letterboxd, including actor, director and studio names, synopses, release dates, trailers and poster art is supplied by The Movie Database (TMDb). Letterboxd uses the TMDb API but is not endorsed or certified by TMDb.

To add missing films or correct inaccuracies for existing films, please use TMDb’s interface (you’ll need to create an account there too). Changes to film data on TMDb will be visible in Letterboxd within 30 hours.”

Does anyone know how to?

Thank you

You have to make a report here what entry do you think is wrong