D-Link ShareCenter DNS-320L User Manual page 200

Section 4 - Configuration
Select Select.default.service.scan to select the port forwarding
services from a list or select Custom.a.port.forwarding.service
to manually configure your own settings.
Click Next to continue.
If you select default service scan, choose the service(s) to be
allowed for remote access from the Internet via your UPnP-enabled
router.
Note: You can select more than one port.
Click Previous to change the Port Forward Rule or Finish to
configure the port forwarding on the UPnP router automatically.
DNS-320L
D-Link ShareCenter™ User Manual
194