Ordermod_Bootstrap Plugin

Hello everyone, first time using the forum.

My name is Renan and i’m a Developer looking for answers…

I never saw before the template language Smarty (maybe I’m not so ‘Smarty’).

I’m using the Ordermod_Bootstrap to create two additional columns into my backend, but at the same time, I want to create two input fields into the final page of Order, like this example:

How could I create this input field and then, set this value to DB?

Thank you!