can't edit it or remove it

I can’t seem to edit the message although I have changed the text in editor. It is still showing the default message (Thank you for installing Bottom of Every Post..).
I have also deactivated it, hoping to remove it altogether from my past posts, and the default message is still showing up on my posts.
http://www.marybbarbee.com

https://wordpress.org/plugins/bottom-of-every-post/