The antenna input of the Spyverter is opposite the USB connector. The connector beside the USB connector is attached to the Airspy input.
If a coaxial switch is used, the Spyverter connector beside the USB port is connected to one of the switched inputs, and the switch common is then attached to the Airspy.
The USB connector is not needed when used with an Airspy SDR.
Or, you can just reference the picture below… (note the USB connector position under the A in Airspy.US)