I'm trying to set up our Stamps.com USB scale to work with ShipRush Basic for UPS. On the setup screen there is an option for 'X.J.GROUP USB Scale (Stamps.com Model 2500i 25LB USB Scale)'. When I select this option, and then click the 'Test Scale' button, I get a pop-up saying, "Unable to test the scale 'X.J.GROUP USB Scale (Stamps.com Model 2500i 25LB USB Scale)' (ZFUSBScalePlugin.dll): Scale not found on this port. Please correct the port setting." Of course, since this is a USB scale there is no port setting option available. Can someone please point me in the right direction? What am I doing wrong?