The iMac is connected to the modem via ethernet. I switched WiFi on as you suggested and the drop-down menu of networks includes several called My Spectrum (Spectrum is my ISP). I arbitrarily chose one and got a dialog box asking for a password, which I copied from the modem but did not enter.
As mentioned before, I logged into the URL for the modem and it says that "Network Access" is "Allowed". Currently, there is no network selected. Being a complete novice, I don't know what to do at this point. I have not purchased anything (Apple TV, Roku, etc.) so there is nothing to connect to.
Advice?
Jon
macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365
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