first:
if a service runs on the machine, all needed ports are opende automatic (http: 80 and 443)
second:
you need a contrib installed to open am additional port (called port-opening-contrib), search the forum or download-area
third:
ports that are not used are closed automatic (they are not opened).
the strategy ist to close all port first and then open the needed ports later.
at last:
use the search function of the forum.
cheers klaus