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All the examples in that page uses something called bbcode which is common on forum, and also works in Geocaching.com logs. However, it does not work on the Profile-page. You will need to write html instead. It should look something like:
<a href="http://project-gc.com/"><img src="http://maxcdn.project-gc.com/statbar.php?user=Jesmond%20Lynam"></a>