http://discuss.i2p/viewtopic.php?p=481
/Note: No distinction is made between upper and lower case, the `/HELP' and `/help' commands are identical./ To start chatting, you need to join a room. To see what rooms exist on the server, type `/LIST'. To join a room or create one, type `/JOIN <room name>'. For example, on my server there is a room called “#muwire”.