D-Link AX1500 Product Overview page 20

Section 2 - Installation
If the router does not detect a valid Internet connection, a list of connection
types will be displayed. Select your Internet connection type (this information
can be obtained from your Internet Service Provider).
Click Next to continue.
If the router detects or you select PPPoE, enter your PPPoE username and
password. If you do not have this information, please contact your ISP.
Click Next to continue.
Note: Be sure to remove all other existing PPPoE software from your computer.
The software is no longer needed and will not work through a router.
D-Link R15 User Manual 15