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In a computer connected to the network, open your Internet browser and login to your router configuration through this address. http://192.168.2.1 If that address doesn't worked, then login through http://192.168.1.1 In there, click Security under Wireless (left column) and you can find or change the Wireless password XXXXX there.
Please let me know if that didn't work, so we can continue troubleshooting. Don't Rate my answer until you are satisfied.