Login to WeGuard console
The landing page would show list of the devices in your account.
For every device notice more option under "Actions" column.
Click on "Replaced".
Notice a prompt asking to put in some details for future references. The notes added while tagging will be shown under "Notes" tab in Device details > Notes.
Clicking "Ok" will tag the device as "Replaced".
Once the device is marked as replaced, it no longer is displayed along with active devices.
To view replaced devices, set the filter to "Replaced".
Depicting device state filter:
Depicting selection of "Replaced" state: