Comments are already active on posts in this th...

This is not possible from your WordPress admin panel, however there is a way to do this by utilizing the framework’s filters in your custom code.

Copy this into the functions.php file of your child theme:

function activate_page_comments( $setup ) {
    $setup['comments']['pages'] = true;
    return $setup;
}
add_filter( 'themeblvd_global_config', 'activate_page_comments' );

NOTE : Remember that all code customizations should always be done from a child theme. So, make sure to check out the final chapter of your documentation on making code customizations.