Board Thread:Support Requests - Getting Technical/@comment-28694993-20160724203229/@comment-24055022-20160724211531

Here's the code they use (I replaced the username with yours):

.comments li[data-user="KarlBoss"]         .edited-by:after {content:"Ellie's Assistant • Redstonia Worker"; color: #FFF;  background-color: navy; border-radius: 6px; padding: 0 5px; margin-left: 3px;}

body.ns-1201 .edited-by > a.subtle[href="http://ellieschatclub.wikia.com/wiki/Message_Wall:KarlBoss"]:after { content: "Ellie's Assistant • Redstonia Worker"; background-color: navy; padding: 2px 6px; border-radius: 6px; color: #FFF; }

You place it in your wikis MediaWiki:Wikia.css to get it.