I’ve seen a couple of mentions of that feature across the help docs, namely that one account can run more than one blog. Yet I don’t see anything remotely close to this in the micro.blog settings.
I spent a bit of time searching across this forum and online but couldn’t find any tutorial on you’d actually do it to check if it’s still there or was deprecated.
In the “Account” menu in the settings, I have a “Blogs” section, but it only lists my current one without any option to add another one.