http://qwikxxeiw4kgmml6vjw2bsxtviuwjce735dunai2djhu6q7qbacq73id.onion/articles/xmpp/intro
If you are prompted for a room address when creating a room, simply input
[email protected] where name is the name of the chat room. You might be prompted to choose between a public and a
private room. The difference is that
private rooms supports encryption
and you must be invited to enter it. Public rooms, on the other hand, only requires you to know the address to join, although
you can also be invited to a public room.