Where is the 8 digit pin to connect to the internet

Trying to connect my desktop, when I connect to my Wi-Fi it is asking me for an 8 digit pin or a security key

"Network key"= "Security key" = Wifi password.

If you are using a Comcast gateway, see https://www.xfinity.com/support/articles/view-change-wifi-password. 

If you are not using a Comcast device please post the model number of your WiFi router or gateway.

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