How do I deploy a rails application to my server using passenger

I am attempting to set up passenger on a ruby stack cloud server so that going to http://my_ec2_server.amazonaws.com/ goes to my Rails application. I'm attempting to follow the instructions here http://bitnami.com/article/tutorial-rubystack-deployment-alternatives

Specifically, section 4.2 references setting up a VirtualHost, but gives no indication where I should add this configuration. Please help!

FYI, my application (named 'server') is deployed at /opt/bitnami/apps/server/current (I am using capistrano to deploy).