You can find the WiFi password in the wireless router's settings (under WiFi). Of course, that means you need the admin password to access the router settings.
I hope you didn't forget that too. If it's the default, no problem, Just see the manual. If not, time to reset the router and start over.
***Note*** I'm assuming it's the WiFi access key (example: 128-bit WEP or WPA) and not the wireless router (admin password) itself like v6dreamer mentioned.





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