This has been a random ongoing issue here for at least a few months. The thing is that it randomly disappears for random people. I just visited your blog and the link was there at the bottom of your posts.
Staff is aware of it and are looking into what is causing it as I remember.
You can get it to come back by editing your latest post, adding a space somewhere and then taking it back out and then saving the post. Do know though that the link may disappear again in a hour or two.
Again, I think most people going to your blog will see the link so I don’t know if it is really something to worry too much about.