You can access the website from the link below:-
https://contacts-demarches.interieur.gouv.fr/brexit/brexit-demande-titre-sejou
Click on ‘Click to register’ below to find more detailed information and help guide.
ONLINE RESIDENCE PERMIT APPLICATION PROCEDURE FOR BRITISH NATIONALS AND THEIR FAMILY MEMBERS RESIDING IN FRANCE OR COMING TO SETTLE IN FRANCE BEFORE 31 DECEMBER 2020