You can change your Wi-Fi name (SSID) or password (WPA2/WEP key) at any time. After you apply the changes, be sure to reconnect any Wi-Fi device with the same customized Wi-Fi network name and password.
Verizon has a variety of tools to change your Wi-Fi credentials:
My Fios app
Change Wi-Fi name or password using My Fios app
If you have a Fios Quantum Gateway or a Verizon Fios Advanced router, using the My Fios app select:
Internet > under My Networks select a network > select Edit to make changes > enter your new credentials.
If your Wi-Fi access is disabled, you will need to select Enable Private Wi-Fi Access.
Note: If you have separate Wi-Fi names for your 2.4 GHz and 5 GHz networks and you change your password, reconnect any Wi-Fi device in use. The password is always the same for both networks.