The UPnP software/firmware is within your modem/router. You need to open the modem device's web page in order to enable UPnP.
eg: a Linksys web address is generally 192.168.1.1 which you type into the http:// address box of your browser. A D-Link address will probably be 192.168.0.1 And a Netgear probably 192.168.1.1, etc. So you need to find out the address of your device. Check your manual or follow the link here & find your brand to get links; Connection problems? Check here first! (click on link)

BTW the test page you tried is only for testing to see if port 6346 is open, not any other port number.