Sidla if you are not the system adminstrator of the pc and or network that you are using then the actual admin probably wont be too pleased if you start bypasing there security. Chances are though, if everyone on this board pooled there knowledge you would still not get you through, you will have to talk to the tech staff and see if they are willing to lend a hand.
The thing is, you basicaly need to hack the system (oh so glamorous term lol) internaly to get through a firewall. Your not allowed to do that so if you finaly did it and get caught then your computer/system privaledges could be taken away.
In my ludicrous oppinion your best chance is talking to the tech staff and seeing if you are allowed to use MIRC, and if they can help you. Either that or shoot the bastards till finaly the ones that are still alive, give in to your demands