AC750 Network Name Change

[Pdixon6455]

I have se-installed a Netgear router and am now using a Comcast service - I need to change the network the extender is attached to?

[plemans]

I usually recommend factory resetting and re-installing extenders when you change routers. 

You didn't put what model you have but you can find the manual/install guides at:

netgear.com/support/   then type in the actual model number and it'll take you to the manual/guides.