How to run a simple hello world application using mean.io
<p>I am new (few hours into it)to mean stack development.I was starting up with documentation in mean.io website .Here I am confused how / where to run helloworld.js from?
localhost:3000 gives mean home page
I have just a static html page with alert box showing hello world 
how to run this ??
For Example in case of wamp inside of www folder .So from where or how a application can be run?</p>