The Configuration page is shown by default, and lists Devices, Datalinks and Interfaces, along with buttons for administration. Mouse-over an entry to expose an additional icon, and click on any entry to highlight other components that are associated with it.
The Devices list shows links status on the right, as well as an icon to reflect the state of the network port. If ports appear disconnected, check that they are plugged into the network properly.
To configure an IP address on a network devices, first create a datalink, and then create an interface to use that datalink. The icon may be used to do both, which will display dialogs for the Datalink and Interface properties.
There is more than one way to configure a network interface. Try clicking on the icon for a device, then dragging it to the datalink table. Then drag the datalink over to the interfaces table. Other moves are possible. This can be helpful for complex configurations, where valid moves are highlighted.