Set the WiFi socket to teach-in mode by plugging in and unplugging 3x. When plugged in for the 3rd time, the WiFi socket is in teach-in mode and the blue LED flashes quickly (2x per second).
If the product is still taught in the app, the product can be deleted from the app in "Edit" under "Remove the device"; the data is retained.
The item "Restore factory settings" removes the device from the app and deletes all data on the product.