Problem installing, with nginx

I trying to install Discourse on my server, with NGINX, so when running the install command I get the

If you are trying to run Discourse simultaneously with another web
server like Apache or nginx, you will need to bind to a different port

So I saw this post: Running other websites on the same machine as Discourse

Now, here comes the problem… " Change your /var/discourse/containers/app.yml to look like this:" I dont have that file… I tried doing “./launcher stop app” and I get this error:

Config file was not found, ensure containers/app.yml exists
ls: cannot access ‘*.yml’: No such file or directory
Available configs ( )