Hi tauaafam0611,
I believe currently modem is under auto-configuation but in case if you require to configure modem by manual configuration then follow below steps.
B. Enter admin for both the username and password and click Login. If you have changed the login credentials, please enter the current username and password for your modem interface.
C. You will see the home screen shown on the right. Click the Advanced tab.
D. On the menu on the left side of the page, click Network to expand the menu and then click DSL.
E. Click the Edit button on pppoe_ptm_2_0_d.
F. Enter your TPG Username and Password. Click Save
G. Click the Basic tab
H. On the menu on the left side of the page, click Wireless
I. You can change your Wi-Fi details or keep the default settings. The default Wi-Fi SSID (network name) is WiFi-xxxx (xxxx is a random 4 digit alphanumeric code printed on the sticker underneath your modem).
By default, the Wi-Fi password is printed on a sticker underneath your modem (Wireless Password/Key). Click Save.
Setup complete!
see below link as well
regards
JayeshP9.