If you're hosting it yourself, ActivityPub is a separate component. If someone else is hosting it for you, they will have to add support.
I really hope they'll streamline that a bit more or at least create some documentation that's more than a hand full of bullet points.
If your blog uses WordPress, there is an activitypub plugin so people can subscribe using mastodon or whatever you've got.
I don't think their blog is about ghosts, I think their blog is created with Ghost, not WordPresshttps://en.wikipedia.org/wiki/Ghost_(blogging_platform)
If you're hosting it yourself, ActivityPub is a separate component. If someone else is hosting it for you, they will have to add support.
I really hope they'll streamline that a bit more or at least create some documentation that's more than a hand full of bullet points.
They probably will once it's not in early alpha as the readme says it is.