I followed the steps given here to configure my G3100 router as extender until the point where I am able to access the GUI using its newly assigned IP.
https://community.verizon.com/t5/Interactive-Guides/bd-p/InteractiveGuides
I then connected the G3100 router with my main router. I still see on my original router's page, the newly added devise is coming a router and it does not show up in the sytem status.
When I am accss G3100 router using its IP address, it says "Diconnected".