Tenda AC1200 User Manual page 62

Click Apply/Save to save your settings if everything is correctly set.
Here you can view your configurations. When the PPPoA connection is successful, you can access the Internet.
 Steps 1~6 above for PPPoA and IPv6 Only Users
11) IPoA Users
After you configure the ATM Interface (ADSL uplink) and select IPoA as the DSL link type, you can start to set up
WAN service for accessing the Internet.

Click Advanced Setup > WAN Service and then click the Add button.

Select the ATM interface you added just now from the pull-down menu in the figure below. Click Next.
Wireless AC1200 ADSL2+ Dual Band Modem Router
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