[Mr. T.]

login to router >
Select Enable Applications (front page)
Select Add (bottom of screen)
Select the 'name of your computer' under Networked Computer/Device
Protocol = Select Add
(follow the wizard): give the service a name (any name will work).
Select: Add Server Ports
Protocol = TCP
Source Ports = ANY
Destination Ports = SINGLE (then add the port # of your torrent client)
Apply
Apply (again.. unless you wish to enter multiple ports)
Apply (third time) will exit the wizard & ports will be open

You Do Not Have to Map A Static IP Address With This Modem.
The modem is smart enough to update the routing table itself via name resolution

..pretty cool, huh.