No WiFi Network Codeword Input to my Apple TV

When I confirm my WiFi for connection to my Apple TV it says that I have used the wrong password and to "try again (-3900)" but when I try again I am offered no page to input password.

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Troubleshooting Wi-Fi networks and connections 
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    hi even when i connect my macbook and apple tv to the same wifi network i cant put on the air play mirroring option.my airplay mirroring option does not detect any device.what can i do for this?

    See
    http://support.apple.com/kb/TS4215

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    That is a modem/wifi problem. Contact your ISP.

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