To begin adding devices to the software we would want to press the button towards the top left of the screen. This screen should pop up a window that would show that the software is waiting to add a device.
When this pop-up appears in the software, you would simply press and hold the set button on the device for 3-5 seconds. The software should acknowledge a new device has been added and begin synchronizing the device.
Note: For wireless Devices it is a good idea to input the Insteon ID of the device prior to the set button press.