What do I put in my 2013 child theme to edit bbpress style sheet?

You’ll see I don’t know what I’m doing here. What follows is what I tried.

I put the following into my 2013 child theme:
1. a folder titled “bbpress” which contained the following all copied from the bbpress plugin folder:
2. a folder titled “bbpress”
3. a folder titled “css”
4. a folder titled “extras”
5. a folder titled “js”
6. a file titled “bbpress-functions.php

I replaced the top of the bbpress.css file which was in the “css” folder with this:

 /*
Theme Name: bbpress bbpress-child
Theme URI: https://neighborsconnect/neighborsnation/wp-content/themes/twentythirteen-child/bbpress-child/
Description: bbpress-child theme for bbpress
Version: 1.0
Author: Bruce Wilson
Author URI: https://neighborsnation.org/
Template: bbpress-default
Tags: bbpress, bbpress-child
*/ 

Then I increased the font-size for the bbpress forums from 12 px to 20px and other such changes to see if it worked.

Surprise! Surprise! It didn’t work.

What do I need to do to make it work?

~ Bruce