Help - Configuring Apache v2.2.15 as a reverse proxy to NodeBB

[r2mbo]

Re: Apache 2.2.15 with websocket not working...already backported mod_proxy_wstunnel

So far I have installed and configured nodebb successfully and it is running on port 4567.
But I am struck with the last step which is configuring web server as proxy. My server is running on CentOS 6.8 and I am struck with Apache 2.2.15 . I can see that I need to follow below procedure .
https://docs.nodebb.org/en/latest/configuring/proxies/apache2.2.html

The problem is I am very new to linux and couldn't understand the steps mentioned there. Searched online but couldn't find any article with detailed steps.

Can some one who did this already help me with steps / instructions. Thanks in advance.