external access to owncloud

Hi All

I recently installed owncloud which works they way it should when I'm on my own network. However I have difficulties accessing externally:

I set up a dlinkddns account which tracks my ip however I seem to forward to the wrong port. When I use my dlinkddns address, it sends me to my router login page rather than owncloud.

How can I find out which port nginx is using for owncloud?

Any help is much appreciated :)