When you first boot the system after the installation has completed, you will be presented with some configuration options to complete the install.
You typically start the wizard from a web browser: https://hostname_or_ip_address:81. You must have port 81 accessible to do this.
During the Wizard process you'll be able to set and verify your Network Mode (private/public) and the Network Interface that will be used for external access (necessary for the configuration of certificates). At the end of the process you'll have to validate your access to the ClearCenter (the marketplace) you'll have to register your new install (new account or using an existing account). On connection you'll be asked to update all the core application installed that have been updated.