Hi Sean,
If you want to add a text next to the lock icon, something like this:
http://screencast.com/t/3fK6PuqJXktI , then you can edit the file 'JOOMLA/components/com_easysocial/themes/wireframe/toolbar/default.login.php' and change the below code at line 17:
<span class="visible-phone"><?php echo JText::_( 'COM_EASYSOCIAL_TOOLBAR_LOGIN' );?></span>
to:
<span style="color: #FFFFFF;font-size: 11px;line-height: 15px;"><?php echo JText::_( 'COM_EASYSOCIAL_TOOLBAR_LOGIN' );?></span>
You can actually use the template overriding method and place this file under your template overriding folder for your EasySocial so that in future upgrade, your changes will remain
Hope this help and have a nice day