How to edit shipping address after click order in Magento 1

I want edit shipping address after create order on frontend in magento 1. I used observer, it’s ok, but i cann’t set new shipping address Ex: i want change firstname to “ABC” $orderId = $observer->getEvent()->getOrder()->getData(‘entity_id’); $order = Mage::getModel(‘sales/order’)->load($orderId); $order->getShippingAddress()->addFirstname(“Abd”); $order->save(); And i also try this code but it not working $order = Mage::getModel(‘sales/order’)->load($orderId); $quote =…