Plugin not working

Hi wpmudev Team,

I got your Plugin "Chat" for Wordpress, and configured it....everything seems right and it inserts the chat into my site....but the chat does not work...i can't send messages and it always says "chat closed by moderator"....but iam logged in as admin and still no chance to send anything here.
I can't figure it out what I make wrong here.

So please could you support me with this issue?

Thanks a lot and best regards,
Florian