D-Link DSL-6740U User Manual page 30

Section 3 - Configuration
PTM CONFIGURATION
Click "Add" to create a PTM interface, check "Enable Quality of Service"
for upstream traffic QoS if need.
Then click Apply/Save button.
WAN Service Interface Configuration
Select an interface for wan service.
Click Next to go to the next window
D-Link DSL-6740U User Manual 30