Your client doesn't support the content I posted and thinks it's a blog post.
Discussion
Browser as well
It's not the greatest user experience, because it only works if you're using a client app that supports it, which isn't many.
The easiest method is to use 0xchat and enter the join request string at the top of 0xchat.
groups.0xchat.com'MwKwiWhYwqyjmLJn
