The Pocoo IRC channel is #pocoo on irc.freenode.net. All Pocoo projects share that channel, so please let the others know what project you are talking about when asking a question.
You can use any IRC client to connect to freenode (irc.freenode.net). If you don't have one yet, pick one from the list:
Alternatively you can also use the freenode web interface to join the IRC channel: open #pocoo in your browser.
If you want to read up on older discussions you can access the IRC logs on dev.pocoo.org/irclogs.