I'm afraid for a useful answer, you will need to supply more information.
Firstly, when you say that you have "had our sys admin open port 366 on our firewall" do you mean that this firewall (the one on which you have already opened 366) is a different firewall from the iptables firewall on which you now want to make a change?
Assuming that was the correct interpretation, you need to find out how your existing iptables firewall rules are being created. Probably, the three most popular options are:
- from a graphical front end, prefereably, for security purposes from a different machine
- from a bash script (or other scripting language)
- 'manually' using 'iptables -L' to dump and append/insert
...while you could always create the effect that you want on a one off bassis 'by hand', if, the next time that you reboot, something else kicks in, you'll want to have control of the thing that writes the rules at a reboot.