To be more specific please try to log on the connexion page and use "democlub" as login and "democlub" as PW.
As you'll see you get the page to set the appropriate two authentification process. Let's try to click on (Deconnexion) on the top menu bar located at the top right of the site.
Then you'll realised that your are blocked !
www.monbilansportsante.fr