I have a D-Link DSL - 502T  modem. 

Computer: Compaq Presario SR1520AN
               Memory: 512MB Pc 3200 DDR
               Hard Drive: 80g 7200 RPM Serial ATA
               Service Pack 2 
I am trying to forward ports for DC++ so I can connect to "Active" mode, but don't know how to forward ports as this is a new modem 
Windows XP 
I need a step by step guide as to how to do this
 
Cheers