Create your own chatroom. This is very simple.

Chatroom name:
(e.g. 'Talk')
Access code:
(PIN/password that others will use to access your chatroom, e.g. '1234')
Repeat access code:
(To detect mistyping)
Admin password:
(PIN/password that you will use yourself to manage your chatroom, e.g. 'mysecret')
Repeat Admin password:
(To detect mistyping)
Chat user name:
Choose any name for posting entries. Can be changed later.
Save access data locally
(Saves access data locally on this device. Can be deleted later. Don't check this if this is not your computer/mobile/tablet.)