WPN802 - AP Configuration and deploy

I set up a WPN802 to be connected into a WINDR4000 wifi router. I used DHCP for the address and SSID the same as the wifi router. I plugged it into an open port on the router and now there is a device on the main router's attached devices list with the SSID name, but I can't connect to it. I was hoping I could get to the admin panel in case I needed to make additional configurations, else I will have to reset factory defaults and start over.

Also, how do I know if it is getting used by wifi clients? It is within the network so how do we know if we are on it or the original router?

Thanks, I have other questions but hope this can be resolved first. :rolleyes: