Making NodeJS app publicly available

I am building an azure template (https://github.com/kevinday/azure-quickstart-templates/blob/master/augur-on-ubuntu/azuredeploy.json) that will run a nodejs app in an Ubuntu VM.

npm start> augur-ui@2.0.0 start /root/augur> http-server ./build -c-1 -p $PORT

Starting up http-server, serving ./build
Available on:
  http://127.0.0.1:true
  http://10.0.0.4:true
Hit CTRL-C to stop the server

I'd like to expose http/s traffic to the dns name that I have configured, http://dnsname.eastus.cloudapp.azure.com.

I've seen documentation suggesting configuring and endpoint in the portal, though I no longer see this option. Can someone point me in the right direction for how to modify my template in order to configure this endpoint correctly? Thank you.