Frontend\Modules\Profiles\Actions\Register::execute PHP Method

    public function execute()
    {
        parent::execute();
        $this->loadTemplate();
        // profile not logged in
        if (!FrontendProfilesAuthentication::isLoggedIn()) {
            $this->loadForm();
            $this->validateForm();
            $this->parse();
        } elseif ($this->URL->getParameter('sent') == true) {
            // just registered so show success message
            $this->parse();
        } else {
            // already logged in, so you can not register
            $this->redirect(SITE_URL);
        }
    }