On WordPress, go to your dashboard, find appearance, select widgets. Find an IMAGE (not text) widget. Drag or select that widget and place it wherever you want it — in your sidebar or footer.
Then, leave all those boxes in the widget blank except for IMAGE URL. In that box, type the following exactly:
Save your widget. Take a look at your blog. See if that worked.
By the way:
If you want the blog button to link back to this blog when it is clicked, you can add this in the box that states: LINK URL. In that box, type this exactly: