B1160w no longer connects to network

I have a B1160w printer and a MacOS system. The printer works great over USB, and until recently networking worked. Unfortunately, now the printer's WPS button flashes blue, which the manual indicates means it's attempting to connect to the network.

I recently changed the password to my wireless network, and I suspect that is the issue. But I cannot find a way to change the password on the printer.

In the Dell Printer Manager software, the Embedded Web Service button is greyed out and disabled. In the browser, I cannot connect to the IP address indicated in the software's Network panel and on the Network Information printout.

Can anyone offer any assistance? I realize this is an older printer, but I'd like to get this working once again if possible. Thanks!