You have to go to the /etc/nginx/sites-enabled/
and if this is the default configuration, then there should be a file by name: default
.
Edit that file by defining your desired port; in the snippet below, we are serving the Nginx instance on port 81.
server {
listen 81;
}
To start the server, run the command line below;
sudo service nginx start
You may now access your application on port 81 (for localhost, http://localhost:81).