You have had a couple threads now, and its not clear if we are dealing with different aspects of one installation, or multiple installations, or even if my previous suggestions have been helpful.
I am going to make this simple, I can give pointers, and will generally put at least as much effort into a response as you put into a question. Not always, but that is a guideline I follow.
One sentence questions don't give me a lot of direction about what is stumping you, and requests for step by step guides or illustrated guides (I am not speaking only to you here) tend to get very little concern.
If it is a common scenario it will either be FAQ'ed up on support.dlink.com, or will be once it can be written now that you have pointed our attention in the correct direction (again I am not speaking only to you, this post is about to become a sticky I think). But a detailed guide will generally not be written for obscure or unusual configs because a request from one customer.
If you have a common scenario, or even an obscure one that you want to be sure that we have considered documenting better there is a sticky for that linked below.
That said, I believe there is an FAQ on support.dlink.com for this very scenario! The FAQ I am thinking of is a generic port forward and could be applied to any combination of interfaces. This is where more info about what is stumping out would be helpful.
http://forums.dlink.com/index.php?topic=4103.0
http://www.dlink.com/support/faq/?prod_id=2393
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Topic: how to configure dmz port for a web server (Read 7358 times)