Thanks for your help, Jack. I followed all the instructions on the page you
included in your reply and was able to do everything.
However, when I turned off the laptop's wireless switch and plugged in the
ethernet cable (from the cable modem) that I use for my desktop computer,
there is an "unable to resolve internet address" error message from Cox (our
internet provider). And of course I could not access the internet.
Is it possible that the laptop was never set up to get a wired interface
signal? I will call the Cox tech line tomorrow to see if they can walk me
through the search for a wired connection IP address.