If you want to rescan UPnP devices, click 'Refresh' button.
If you need to set the detailed information of UPnP devices, please click
'Advanced' button, and the following settings will appear:
You can click '?' icon and a drop-down list will shown, then you can
select an icon for the network device you selected. For example, if the
network device you selected is a computer, you can use the person icon to
represent it.