How to setup multiple ports in a workspace


The instructions on how to set up multiple ports in a workspace are not very clear. How do you edit the files necessary to create multiple ports? This is the part of the instructions where I am stopped:

Edit 002-myconfig.conf and change the port number from 8080 to 8081. Set DocumentRoot to whatever path you’d like apache to serve when your project is accessed on port 8081

Edit /etc/apache2/ports.conf and add Listen 8081 just below Listen 8080

I can’t access those files.