Go to: site-root/administrator/modules/mod_quickicon/helper.php
array(
'link' => JRoute::_('index.php?option=com_jevents&task=icalevent.list'),
'image' => 'header/icon-48-language.png',
'text' => 'Calendar Events',
'access' => true
),
In the example above the link goes to the JEVENTS component. I wanted to place a quick icon for Joomla 2.5 because I want my client to easily be able to access what they need to access. You can replace the LINK with your custom link.