I tried using this today. I couldn't find a way to rename the site I signed up for; I didn't make the connection that the username would be the URL/site name.
I also couldn't delete my primary site to create a replacement, so I had to close my account just to create a site with a new name.
Just thought I'd let y'all know a minor inconvenience I ran into.
I’ll make it more obvious on registration that the name can’t be changed :) I’m sorry about that. I’d add a username change option but it would actually require a lot of updates to the backend