@clairhe
i’ve got the same problem
Meaning you don’t see the Featured Content option in the Customizer? The Feature Content feature requires an active Jetpack connection to work, and it doesn’t appear like your site is currently connected to Jetpack:
https://jetpack.com/support/debug/?url=http%3A%2F%2Fwww.geai.bzh%2F
You’ll need to install that plugin, and connect it to a WordPress.com account in order to make use of the Featured Content slider in the theme.
You can find more information on that feature here:
https://jetpack.com/support/featured-content/
Also i can’t personalize menu’s colors
This theme doesn’t have built-in color settings that you can change. You’ll need to use custom CSS or a child theme if you want to customize the site colors.
and I only have one location for the two menus, so i can have my social networks buttons.
The Social Menu is also added to this theme via Jetpack:
https://jetpack.com/support/social-menu/