When prompted enter admin in the Username field and password in the Password field:
Step 3: The Gateway Page should appear. Click Wi-Fi on the top left.
Step 4: Click on the 2.4Ghz Tab.
Step 5: You can now type in a new Wireless Network Name (SSID), enter this into the Network Name box.
(highlighted in yellow on the image above).
Step 6: If you want to change the Encryption key (WPA), enter this into the Network Key box.
(highlighted in yellow on the image above)
Note: If you face any problems, you can reset the modem back to factory defaults. This will reset the SSID and Encryption key to the one that is printed on the bottom label of the Gateway.
Step 7: Then click Apply at the bottom.
Step 8: If you want to change the SSID for the 5Ghz Wi-Fi as well, click the 5Ghz tab and then follow steps 5-7 again.
Step 9: Browse to media.telstra.com.au to check the connection.
On a side note, this modem can also have its SSID and WPA configured by selecting the networks in advance options which will give you a different control screen similar to this one:
Remember:If you have changed your SSID and/or Encryption Key, you will need to use this when connecting any computers wirelessly to the Gateway, you may also be disconnected from the network after clicking save and this might also result in you having to reconnect straight away. If you are unable to access the network you can also hard reset the modem and this will revert the gateway back to the default SSID and Password (usually noted on the back or bottom of the modem for convinence.