Hi thank you for all your answers.
1) Looking at the page, I see the login form. Twice in fact. Make sure to have the [connections_login] shortcode only once.
it works now, it was not “instant” :). Ok.
2) To fix, navigate to the WordPress Permalinks settings admin page and remove index.php from your permalink structure.
the choice in admin panel is limited. I can remove index.php only in the “personnal structure” but if I do that all the links are broken
3) Can we create video field with form extension ?