To add a new system manually to the following. In the SAP Logon, click the "New" button, choose the "Advanced" tab and tick the "Expert settings: checkbox. For server host.domain and system number nn configure it like this:
You can also get connection details from a separate config file either local to the machine or available via a URL. See the installation guide for how to configure that. The connection details in that file will be the same as above.
Steve.