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Where is the security key on a comcast modem located? The security key on a Comcast Modem is located next to the serial  number of the unit. Sometimes the serial number is the number used  as a security code if it is not printeâ¦d on the device. (MORE) 1 person found this useful.
4. Enter the default administrator login name (usually admin) followed by the default administrator password. You can locate the the default admin name and password for your specific router by checking the manufacturer's website or by Googling Default Admin Password followed by your router's brand name and model.5. Click on the Admin page from your router's configuration page and create a strong password.Be sure you enter a strong complex password for your router's admin password. If you ever looe this password you will have to repeat the steps above.ere are the general steps you will need to follow in order to change and/or reset the password on your wireless router: If you have completely lost the password that you set and need to set the router back to its factory default password, perform the following steps: Below are general instructions only.