Pointless Sin puntuar aún
Back to the drawing board - this is crap. It accepted only two out of six blogs - all the rest returned obscure errors from Blogger when I tried to add them. The most annoying, apart from "unknown error" is "If you are embedding video, close embed tags" - it's a plain text blog for godsake. And yes, I did check out the blogs' logins directly on Blogger - they are all fine.
On one I could use with ScribeSquirm, the html tagging doesn't render but is printed in the blog, making a mess of it and requiring proper editing in the Blogger editor. So what's the point?
This add-on is being quickly demoted to add-off.