Go to System and status in your admin menu and click on rescan
modules.

Now you should be able to go to <yoururl>/chat and see your chat
window. You’ll see Anonymous <long number> in the right-most
pane. That’s you. If your chat buddy enters the chat page, a second
Anonymous <another big number> will appear. When you or your buddy
leave the chat page, the respective Anonymous tag will disappear. Note
that chat messages are not stored or logged. That may come with a
future version of zchat.