How to add coupon code to Customer orders

I have created a menu - Customer orders. If user enters an order in this menu it gets a view of all order details, but there is no coupon code here. I can see only the amount of coupon, but not the code itself. How to add coupon code to this window?

Hello,

In order to better answer you, can you provide an Url link to see the context.
Awaiting your returns to answer you precisely.

Regards