@SirTapTap Ahh. Yes, that's normal. Every post is a post in that blog's “instance”.
You then can follow it. And when you publish a new post, you should see it.
For the URL, I can't remember much about it since that last time I used #WordPress was in 2020; I migrated to #Hugo / #GoHugo late 2020.
But what I can remember, the plugin at that time will create a new post with your WP “summary” as the post content, then a link to back to your website for the full article. Something like a summary-only Atom / RSS feed.
To find the #ActivityPub link, I right-click on the date/time of the post it created and figured out how it creates the URLs.