D-Link DSL-2790U - UPnP Configuration; UPnP Setup

76D-Link DSL-2790U Wireless N300 ADSL2+ Modem Router User Manual
Section 4 - Conguration
UPNP
UPNP SETUP
To enable or disable Universal Plug and Play (UPnP), click UPnP.
Check the box to Enable UPnP.
Click Apply when you are done.