How do you get the banner link thing to work?

I tried to put it on my site but it didn't work. As you can see in my siggy here for example, What I did is simply cut and pasted the code you can now see in my siggy, but it doesn't show the banner graphic. Obviously I'm doing something wrong, any help would be most appreciated.

"I am enough of an artist to draw freely upon my imagination. Imagination is more important than knowledge." Albert Einstein

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