I think some folks are thinking that the chat is only open on Fridays – it isn't, though that's when it gets advertised/hosted for largely traditional reasons dating back to when kaitlia777 started the first community chatroom last year. Seriously, if anybody wants to use it at any time, go for it. If there's nobody else there, wait a bit and someone else may well show up (I generally have the chat up in the background if I'm online).
From a web browser, go to: chat.mibbit.com, enter your preferred nickname and go to channel #xmfc_chat
If you prefer to set up a channel in a chat client, the server is irc.uk.mibbit.net, no password; just point it (via "join a chat" or equivalent) at the channel as above and you should find us!