Nickname check and more obvious join on web interface

[p182]

When I firstly tried to comment, I entered "I try to dig into IndieWeb, but can't choose constant domain name, are there's way to link different domains to ID in IndieLogin?" as my nickname and it was accepted, but didn't joined to chat, therefore I see post box, but can't submit it, it declined by server without any errors, also I don't find, how to change it, please, review and fix that