80CC9C7B7B90

Do you have a C7000 gateway modem? 

Please don't post serial numbers or MAC addresses in public forums. 

Review the Installation guide and User manuals on how to change the SSID name. Use a wired PC and web browser to connect to the modems web page. https://www.netgear.com/support/

https://kb.netgear.com/23439/How-do-I-change-my-NETGEAR-router-s-WiFi-password-or-network-name-SSID