nginx is listening on a different port
By default, HTTP works over port 80, but when you connect to that port you are reaching Apache.
You need to find the port nginx is listening on (from the article you link to:
listen 80 default_server; shows
80 but lets say it was
81) and connect to that instead: http://localhost:81/`
nginx and apache are trying to listen on the same port and apache won
You need to turn off Apache (and possibly restart nginx).