When you install ISS services[1] on one or more servers, ISS Setup wizard will ask for the connection information of the Admin service during installation. Using this information, each service will report itself to its Admin service. An admin user will have to register these services to be included in the ISS System.

Use ISS Setup to do this. Launch ISS Setup, and login to the Admin service. Select Services icon and use + icon to register these services.

[1] except ISS Federation service