Ok, lets say I have a custom service application.
I add a new server to my farm, and I want it to take on an "App Server" role.
I go to Central Admin -> Services on Server. I select my newly added server.
I can stop the SharePoint Foundation Web Application service, and effectively stop my new server from being a WFE.
But, I don't see my custom service application in the list of services on my new server, so how do I add a service instance of my service to my new server, so I can start it?
I saw this basically identical question, but it does not provide a clear answer.