## Try this if you are using Woocommerce   

    function ws_new_user_approve_registration_message(){
                $not_approved_message = \'<p class="registration">Send in your registration application today!<br /> NOTE: Your account will be held for moderation and you will be unable to login until it is approved.</p>\';

                if( isset($_REQUEST[\'approved\']) ){
                        $approved = $_REQUEST[\'approved\'];
                        if ($approved == \'false\')  echo \'<p class="registration successful">Registration successful! You will be notified upon approval of your account.</p>\';
                        else echo $not_approved_message;
                }
                else echo $not_approved_message;
        }
        add_action(\'woocommerce_before_customer_login_form\', \'ws_new_user_approve_registration_message\', 2);