function sq7_get_user_first_name($output) {
    if(is_user_logged_in()) {

        $current_user_firstname = wp_get_current_user()->user_firstname;
        if ($current_user_firstname) {
            $output = str_replace('##member_first_name##', $current_user_firstname, $output);
        }

        $current_user_lastname = wp_get_current_user()->user_lastname;
        if ($current_user_lastname) {
            $output = str_replace('##member_last_name##', $current_user_lastname, $output);
        }

        return $output;
    }
}
add_filter('kleo_bp_replace_placeholders', 'sq7_get_user_first_name');