Thread:Project:Support desk/Username formatting

Versions:
 * MediaWiki 1.16.0
 * PHP 5.2.14 (not relevant)
 * MySQL 5.0.91 (not relevant)

How do you use username formatting like at http://testwiki.org/w/index.php?title=Test_Wiki:Request_for_permissions&action=history (e.g. bold, color, etc.)?