change order confirmation mail

-- url of the page with the problem -- : www.tgw14.be
-- HikaShop version -- : 2.2.3 starter
-- Joomla version -- : 3.2.1
-- PHP version -- : 5.4.18
-- Browser(s) name and version -- :
-- Error-message(debug-mod must be tuned on) -- : Error_message

Hi, I want to make a little change to the confirmation mail and already found I have to do this in the file order_admin_notification.html.php. The problem is that I want to add the username or login name the person uses to access the site and I have no idea what variable this is. My knowledge about php and so is very basic, can somebody help me with this?

This was exactly what I was looking for, thanks!