Hi,
First, you talked about screenshots but there is no screenshot at all in this thread. I guess that you had a problem whilte attaching images.
After that, when you edit a customer address, it edit the customer address, not the order address.
An order is fixed in the time line. If someone change his address two years after an order, we won't update it. When he made the order he have an address and that's it.
If you want to change the address in the order, you have to change the address, in the order.
So you can forget the previous post of Mohamed, except for point 2.
Adding a "new customer" button in the order is a quite important development and it's not something which can be added like that in few minutes. So the best if you don't have the skills, is to find/hire someone.
We have a commercial jobs section in the forum, you can also ask for a quote using our "contact us" page. We can also send you some contacts of external developers which made some custom developments for HikaShop.
Regards,