I've seen a post about this on many blogs lately. I investigated to see what it was all about. On my right sidebar you can now find a button allowing you to follow my blog using this reader. I still don't know what it means to "claim my blog". I think the button works fine. I followed the instructions on Bloglovin. Nowhere did I find instructions telling me to write a post to "claim" my blog. So it is still a mystery to me, but that's OK as long as the button works.
If you have any insight on this, or if clicking on the button doesn't work, please let me know in a comment.