D-Link DIR-840 User Manual page 17

Section 3 - Setup
If you selected PPPoE, enter your PPPoE username and password.
Click Next to continue.
Note: Make sure to remove your PPPoE software from your computer. The
software is no longer needed and will not work through a router.
If you selected PPTP, enter your PPTP settings supplied by your ISP
and your PPTP username and password. Click Next to continue.
If you selected L2TP, enter your L2TP settings supplied by your ISP
and your L2TP username and password. Click Next to continue.
D-Link DIR-840 User Manual 13