This is off topic but I wanted to share to non readers of this blog seeking to remove LinkWithin. I have disabled the LinkWithin widget as I suspect it to be in some way malicious. This widget once installed seems to embed its code and the company will not supply any information how to remove it. That should ring alarm bells.
Because I do not know if what I have done is safe or not I suggest if you want to remove it then first look up the methods suggested elsewhere. What I did was find the one line with linkwithin word in the HTML of blogger and alter it’s reference to the script HTML4 to read HTML5 then save which prompted blogger to ask if I want to remove this code or words to that effect.
Always back up your blog before doing anything.