Here's what I did to get the button to work.
I went to
registered with them.
Uploaded the 'button' from
which added it to my 'album'
then I clicked on the HTML link under the picture (on the left side of page in my case) then it gave me an option at the bottom of creating the tag. I copied the url thingy that wasn't a clickable thumbnail and then pasted it to my KH signature.
That sounds complicated, but it's really not.
I don't know if this helps or makes it more confusing.