Scott:
Welcome to WHS.
Some versions of this router support UPnP. Look HERE, for example. Make sure you have the latest firmware for your router.
If your version doesn't support UPnP, you can still have remote access and the website, it just requires forwarding ports 80, 443, and 4125 from your router's configuration pages. Lots of info on this router HERE. Exactly what steps you take to forward the ports will depend on the version you have - it looks like it's listed on page 33 of the version 1 manual. Basically, you set up your server to have a static IP address on the network and them forward the above ports to that address using the TCP protocol.
Hope this helps. If you need clarification on these steps. please let me know.
Regards:
Merrill