D-Link AC750 User Manual page 21

Section 3 - Configuration
If the router detected or you selected PPPoE, enter your PPPoE User Name
and Password and click Next to continue.
Note: Make sure you remove the PPPoE software from your computer. The
software is no longer needed and will not work through a router.
If the router detected or you selected PPTP, enter your PPTP User Name,
Password, and other information supplied by your ISP. Click Next to
continue.
If the router detected or you selected L2TP, enter your User Name,
Password, and other information supplied by your ISP. Click Next to
continue.
D-Link DIR-818LW User Manual 16