Accessing computer through dyndns w/ AE

Hi. I have a cable modem (Optimum Online) connected to my Airport Express, which gives me internet access on my iMac G5 and all our asstd laptops. I'd like to be able to remotely access certain folders on my iMac. I used to do this with dyndns when I had a router and a computer hooked in thru ethernet. Now, I'd like to do it using AE as my router. I've read about port forwarding, but I guess I'm not sure how to reconfigure the "Network" settings on the Airport Admin...
do I have to share a range of IP addresses, or do I turn off Distribute IP addresses and manually set an address on all my network computers?
Help!

See the detailed instructions posted in the article How do I use port mapping

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