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Hi @pamela1900,
Sorry to hear that you are having issues connecting to the WiFi of your modem.
The default WiFi password is in the sticker which may be labeled as "WPA", "WPA-PSK", etc.
Here's a community link; https://community.tpg.com.au/t5/Featured-Articles/NBN-FTTN-FTTB-Setup-General-Setup/ba-p/56, which will guide you on how to locate the WIFi password and name.
Let us know should you require further assistance.
Kind regards,
BasilDV