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You can do all of this by visiting the Web UI of the modem: http://192.168.1.1/
You will likely need to log in using one of the following usernames and passwords if you have not used the GUI yet, but once in you simply need to visit the Wireless settings in the router.
admin / password (If this is accepted you will need to change the password)
admin / password1
admin / admin
admin / admin1
admin / Modem's Serial Number
admin / verizon
admin / verizon1
Please change Wireless settings while you are wired into the router.
@Smith6612 wrote: Please change Wireless settings while you are wired into the router.
To the OP: Make sure you do THIS.