How do I port forward MINECRAFT?

I have looked high and low and have found NOTHING helpful. I've been through many "tutorials" and all they say is "oh yeah, and don't forget to port forward" or "go here to learn how to port forward" and it never works. Anyway, I'm using a D-Link DIR-655 on a Mac,... show more I have looked high and low and have found NOTHING helpful.

I've been through many "tutorials" and all they say is "oh yeah, and don't forget to port forward" or "go here to learn how to port forward" and it never works.

Anyway, I'm using a D-Link DIR-655 on a Mac, although my OS has nothing to do with it.

I'm looking for step-by-step directions on how to do this.

Or just somebody to tell me how to port forward, because it never works.
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