Now What?

Try deleting the App from the phone and reinstalling.  I assume that you tried turning off both your phone and router and then restarted both

Thanks for the suggestion mahler 123, but the actual solution turned out to be so obvious that I overlooked it. Those with higher tech IQs than mine will laugh, but all I needed to do was re-establish my WiFi using the Surfboard's ID code. To those who are thinking of buying a Surfboard router and who share my deficiency of tech savvy, be advised that the literature that comes with the router does not give any info on how to connect it to your system. The needed info is printed on the inside of the box, where you are given options to do that. The easiest (at least in my case) was a Google address that allowed you to get the router up and running.