Hi @Alyson1965,
This article may help you in setting up your modem: New Connection Setup Help
Please note that the modem you have should match the NBN technology you are subscribed to. You will find this info on the article above.
Otherwise, send us your TPG account details (Customer ID/username) via private message in order for us to assist you further.
Thanks!
Ahra_G
Have new nbn account, using old modem, is not working, have been notified account is active
