airport ports

[poohat1000]

hi i cant work out how to forward certain ports that i need to play games etc..

my set up is as follows

internet comes in to a draytek 2500 which is controlled by a ****** Dell (i know i know) - this cable, from out of the drayek then connects to my airport which sends wirelessly to my mac... because of this two router problem how should I go about opening a port?

any airport tut's on this would be very very helpful


thanks everyone