As the title describes, how can i set the "Notify" option as active by default, for any new list created by the users? I want it always checked.

Thanks

@pitbull
Unfortunately plugin does not have such option, you will have to update plugin files (ajax.php)
    ModelFI::newInstance()->addFavoriteList( __('Favorite List', 'favorite_items'), 1, $user_id, osc_is_web_user_logged_in() ? 1 : 0, 0 );

I think last parameter is for notification