How do I edit the user profile questions?

Hi, I'd like to be able to edit the questions/fields asked within the user profile in directory.
For one I want to make it more UK compatible (no zip codes!) and change a few areas for contact telephone numbers.
I have looked through the files but can't locate the actual file to edit and include in my child theme.

I am not sure if this profile is public access but I would want to restrict it so that only admin and user can see it. Is that possible?

thanks
David