Instructions on how to put a button on your Blogger blog.
Click on "Design"
Click "Add a Gadget"
Select, " HTML/Javascript"
Copy the "code" (or HTML) in the scroll box below the button you've chosen
Paste that "code" (or HTML) into your HTML gadget.
Click "Save"
Drag and drop the HTML/Javascript gadget to the place you would like it on your blog.