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In a computer that is connected to the network (via Wired), open your internet browser and goto http://192.168.1.1
This will open your router configuration window. When asked for username and password, enter admin as password XXXXX leave username blank. Click OK
In the Configuration page, click on Wireless tab. Then in there, just under Wireless tab, you can see the Wireless Security tab. Click on it and you can find or change the Wireless password XXXXX there.
Refer this video : http://www.youtube.com/watch?v=DhNAsnqnHWc
Please let me know if that didn't work, so we can continue troubleshooting. Don't Rate my answer until you are satisfied and solved the problem.