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If you are asking about your Wifi network name and password (aka "Network Key"):

• If you are using a Comcast/Xfinity gateway, see https://www.xfinity.com/support/articles/view-change-wifi-password
• If you are not using a Comcast/Xfinity device please post the model number of your WiFi router or gateway.
• If you change this password online you'll also have to update it on any WiFi devices that use it.

If you are asking about the password you use in email clients and to log in to the Xfinity app, webmail, and other web pages:

• See https://www.xfinity.com/support/articles/changing-or-resetting-your-password
• If you change this password online you'll also have to update it on any devices, apps, and programs (email, Xfinity app. etc.) that use it.