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I have ETHERNET connection, but I found that activating wifi for this setup procedure makes things a little easier because you don't have to log off>log on>log off>log on to different networks when setting up AN3): Use wifi for first part of setup, then fall back cable
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As mentioned I found that using pc's wifi in addition to cable to connect to AN3 via browser address 192.168.168.168 is a "less messy" way than logging on/off different wifi's during setup as this can get confusing if the AN3's first try to connect is not successful)
Maybe older Nano's had a LAN port but the latest ones are WiFi only so cable connection is not possible.
There is no need to change the PC's WiFi address, just make sure that the PC or router broadcasts its SSID so it can be selected from the list that the setup program will display after logging in.