Add textarea to carrier backoffice

[misenec]

Hi all.

Can someone help me?

Need add textarea to carrier backoffice. (need add some information about opening, ...)

I start with writting override/controllers/admin/AdminCarriersController.php but i think don't write it good.

I extend:

 

class AdminCarriersController extends AdminCarriersControllerCore

 

__contstruct()

 

renderForm()

 

But anything don't change in back-office.

Can someone write how to added it please?

 

Thanks for all answer.