How to change my real name on Colloquy?

Okay, so I was stupid and used my real name to register with IRC (I know, don’t even tell me, I know that it was really stupid of me), so when people click my name they could see my real name if they wanted to.

How can I change this? I searched some forums and they were like: type “setenv IRCNAME “what you would like to appear”, but I don’t know where to put that. I’m also using my Mac, which might change some stuff around. Is there any way for me to change my “real name” on the get info part without using my username?