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Hi @uyenuyen3011 . What instructions are you using for installation?
Cable from computer goes to a LAN port on wifi router.
The rest of setup depends on type of NBN connection. Is there a NBN box or just the wifi router?
If no NBN box, telephone cable from wall socket to DSL port on router.
If there is a NBN box, ethernet cable goes from NBN box to WAN port or WAN/LAN port on router.
Are you pertaining to the instruction here: https://support.tpg.com.au/how-set-telstra-smart-modem-gen2-nbn-fttc
4. Connect your computer or any device to your modem by plugging an Ethernet cable from the device to one of the yellow Ethernet ports, or you can connect your device via WiFi.
Were you able to make it work? If not, let us know of what else have you tried and will analyse it for you.
BasilDV