Once connected to the extender’s temporary network:
Open a browser and type http://extender.linksys.com or 192.168.1.1 (if the first doesn’t work).
You’ll land on the setup interface. Follow the on-screen instructions.
When prompted, select your WRT54G’s WiFi network from the list.
Enter the WiFi password you set on the WRT54G earlier.
Continue following the prompts. The WN2500... https://wifi-linksys.com/how-to-connect-linksys-wn2500rp-to-wrt54g/