Read as much as you can at
Port Forward.com, namely the
Start Here page and all the links it contains (don't worry, it's brief). If you want to use port forwarding you must have a static IP [I use MAC Address Control, but it's the same concept].
After that, check out their
BitTornado Guide.
Once you've done all that, you should be getting green. But if you're not, and your settings are all correct, it could get even uglier... You should check out
this thread to try and find out exactly what's going on. The torrent featured at the very beginning of the thread will generate an error message to tell you what's wrong -- you may have to give it a few seconds.