Thread: Add meta box on "edit order" page

Add meta box on "edit order" page

Hi

I want to add an extra meta box on the "Edit Order" page from my child theme.

Example on what kind of box I want to add:
Markering_008.png

The reason why I want to add a another box, is because I want to add a button to the box, where I can print invoices.

I have already made the printing function, I just need help adding the meta box, via my child theme.