Hey bud
Style Properties -> Breadcrumb - > Jump Trigger Content
Replace it with whichever code you'd like:
http://fontawesome.io/icons/
However on yours you may need to check two things, check the breadcrumb template and make sure this is there towards the top:
Code:
<fieldset class="breadcrumb">
<a href="{xen:link misc/quick-navigation-menu, '', 'selected={$quickNavSelected}'}" class="OverlayTrigger jumpMenuTrigger" data-cacheOverlay="true" title="{xen:phrase open_quick_navigation}">@xb_bcJumpcontent<!--{xen:phrase jump_to}...--></a> <xen:if is="@xb_enable_collapsesidebar"><a href="#" class="sidebarCollapse" title="Close or Open Sidebar"><xen:comment>@xb_collapsesidebarcontent</xen:comment></a></xen:if>
Then check style properties -> Breadcrumb -> Jump Menu Trigger -> Revert the property(removes the background image)