If you go to User CP in the blue bar above and then click edit avatar it will take you to the avatar page. There are hundreds to choose from - once you've selected one click on save at the bottom of the page and you should be all set.
I was going to try it myself but can't seem to find the avatar you're speaking of. Can you tell me what heading it's under and what number it is? Maybe it's a glitch in the boards. They burp sometimes.
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