Qubes networking asssistance

I understand the first part of this, but not the second.
Have you read this?

Is anyone able to assist me in getting this set up please?
I just don’t know what files I need to be looking at.
I have removed, altered and broken files many times.
When you are working on a file, take a backup first. That way, you can
quickly revert to the state before your changes. Make this second nature.

Happy to help, but it would help us if you detailed what you have done and
with what result.

I never presume to speak for the Qubes team.
When I comment in the Forum I speak for myself.