For unknown reasons, a few people have issues using the embedded chat for IRC. If you don't want to install an IRC client like xchat then these steps will allow you to connect to the chat without installing anything.
go to
http://mibbit.com/chat/ you will see "Server | Auth | Charset"
click on server and enter ghrrc.hopto.org
for nick enter your desired nickname
then enter: #bap_pu for the channel
click go.
i think you can book mark this page so you dont have to enter the info each time (you may need to create an account at mibbit for it to remember though)