How do I use XMPP?
With an XMPP client. You log in with your kallist credentials and it just werks
Hidden Service address: kallist4mcluuxbjnr5p2asdlmdhaos3pcrvhk3fbzmiiiftwg6zncid.onion
What's a good XMPP client?
Official MUC Room
discordia@muc.kalli.st