how to disconnect a device

I plugged in an xFi pod at the wrong time and it was recognized as a device connected to my network.  I want to disconnect it but none of the advice I can find works.  Xfinity Home app directs me to Xfinity app.  In the Xfinity app the device details say it can't be forgotten until disconnected.  But there is no way in the app to disconnect it.  A patient customer service person directed me to the web-based Admin app.  I can see the list of devices but the edit key doesn't do anything useful, I can't find a place to delete the device.  Although the device is unplugged it is still listed.  I tried unplugging and restarting the gateway but that had no effect.  My iPhone and iPad have up to date ios and my Xfinity app is current.  Any other ideas?