Yeah essentially you just set the correct url with your /forum path in config.json and set your reverse proxy to forward that path onto NodeBB:

I followed this guide: https://docs.nodebb.org/en/latest/installing/os/ubuntu.html
I can access the forum using the ip address and port. I have pointed the IP address at the server.I have also changed the domain in config.json to my domain name.
When I visit the domain I get an error 521. I don't think that nginx was installed.
Do I need to install Nginx and then point the domain at the nodeBB folder?
Tom
@tomanagle can you get to the forum by using domain:port?