|You'll have to connect to the extender and change the SSID to match your new router. Typically, you would connect to the LAN IP of the extender through your web browser in order to access the management interface.|
If you don't know your extender's IP offhand it might just be simpler to change the SSID on your new router to the same as the extender.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.