NetGear EX6120 AC 1200 WIFI Extender - Create New WiFi Connection to Replace former WiFi Connection

I purchased the NetGear EX6120 AC 1200 WiFi Range Extender in Aug 2022, and it no longer has NetGear software support.

We just completed a move and are on a new WiFi Connection and router/modem with the same IP provider Spectrum Internet. I can see the NETGEAR_EXT connection in the Manage Known Networks list, but not in the Show Available Networks list.

I am having difficulty creating a new WiFi connection to the Range Extender. I think I have followed the instructions correctly, but not even getting the IP address to come up online at NetGear site.

I am also trying to  delete the former 2GEXT and 5GEXT connections to the Range Extender showing up in Available Networks list {as wrong/former SSID name now}, for which I selected "Forget" in the Manage Known Networks list.

I am trying to make the changes wirelessly, as the home's ethernet ports are not convenient. Should I connect to ethernet directly at router? 

Looking for some step-by-step instructions better than what I have been doing.

Looking for Community assistance if possible. Thank you.  

Dave Laucella