Hi there JT,
Well spotted !!
Indeed, prior to the upgrade to
YaBB version 2.2.2, there was a chat room feature within the forum. However, this feature was an 'add on' - ie. not something not comes bundled with a default
YaBB Forum install (any version). So, as part of the upgrade to the latest release the chat room was lost I'm afraid, as it wasn't compatible with the new forum version.
The good news is that it will return shortly ...

Once I have finished configuring the CSS for the current
YaBB version, I need to upgrade to
YaBB version 2.2.3. This will add a few extra features and iron-out a few annoying bugs ('smilies' not always displaying as they should, for example). At this point I will be in a position to re-install the chat room as it has already been re-coded by the author to work with
YaBB versions 2.2.2 and
2.2.3.
As usual, watch this space ...

D