I don't see anything but the chat window. Just in case the files aren't in the proper locations or a hack was missed here's the list and location of the files being touched.
FIREBOARD.PHP - components>com_fireboard
ADMIN.FIREBOARD.HTML.PHP - administrator>components>com_fireboard
ADMIN.FIREBOARD.PHP - administrator>components>com_fireboard
FIREBOARD_CONFIG.PHP - administrator>components>com_fireboard
ENGLISH.PHP - administrator>components>com_fireboard>language
Those were the only files I touched.
Also the chatmy folder is supposed to go in the plugins folder of your active template.
That's about the only support I can give you. Like I said I'm
NOT any kind of programmer or developer. Just someone that experimented with this implementation.
Edit*
*I just noticed that there may be some BBcode element in the text file I included. Probably form me copying and pasting back and forth from my post. I've attached the "clean" set of instructions.