Busca el titulo de algun gadget de la sidebar, asi la encontrarás.
He encontrado varios como este:
<div class='clr'/>
<div class='sidebar-wrapper'>
<b:section class='sidebar' id='sidebar' showaddelement='yes'>
<b:widget id='HTML2' locked='true' title='Social Profile Icons (Do Not Edit Here!)' type='HTML'>
<b:includable id='main'>
<h2>Connect</h2>
<!-- Social Profile Icon -->
<div class='social-profile-icons'>
<ul>
<li class='social-dribbble'><a href='#' title='Dribbble'>Dribbble</a></li>
<li class='social-facebook'><a href='http://www.facebook.com/blogtipsntrick' title='Facebook'>Facebook</a></li>
<li class='social-gplus'><a href='https://plus.google.com/b/102456708850876742162/' title='Google+'>Google+</a></li>
<li class='social-linkedin'><a href='http://in.linkedin.com/in/blogtipsntricks' title='LinkedIn'>Linkedin</a></li>
<li class='social-pinterest'><a href='http://pinterest.com/blogtipsntricks/' title='Pinterest'>Pinterest</a></li>
<li class='social-rss'><a href='http://feeds.feedburner.com/chandeepsblogtips' title='RSS'>RSS</a></li>
<li class='social-twitter'><a href='http://www.twitter.com/chandeeban' title='Twitter'>Twitter</a></li>
</ul>
</div>
</b:includable>
</b:widget>
<b:widget id='PopularPosts2' locked='false' title='Los más populares:' type='PopularPosts'>
<b:includable id='main'>
<b:if cond='data:title'><h2><data:title/></h2></b:if>
<div class='widget-content popular-posts'>
<ul>
<b:loop values='data
osts' var='post'>
<li>
<b:if cond='data:showThumbnails == "false"'>
<b:if cond='data:showSnippets == "false"'>
<!-- (1) No snippet/thumbnail -->
<a expr:href='data
ost.href'><data
ost.title/></a>
<b:else/>
<!-- (2) Show only snippets -->
<div class='item-title'><a expr:href='data
ost.href'><data
ost.title/></a></div>
<div class='item-snippet'><data
ost.snippet/></div>
</b:if>
<b:else/>
<b:if cond='data:showSnippets == "false"'>
<!-- (3) Show only thumbnails -->
<div class='item-thumbnail-only'>
<b:if cond='data
ost.thumbnail'>
<div class='item-thumbnail'>
<a expr:href='data
ost.href' target='_blank'>
<img alt='' border='0' expr:height='data:thumbnailSize' expr:src='data
ost.thumbnail' expr:width='data:thumbnailSize'/>
</a>
</div>
</b:if>
<div class='item-title'><a expr:href='data
ost.href'><data
ost.title/></a></div>
</div>
<div style='clear: both;'/>
<b:else/>
<!-- (4) Show snippets and thumbnails -->
<div class='item-content'>
<b:if cond='data
ost.thumbnail'>
<div class='item-thumbnail'>
<a expr:href='data
ost.href' target='_blank'>
<img alt='' border='0' expr:height='data:thumbnailSize' expr:src='data
ost.thumbnail' expr:width='data:thumbnailSize'/>
</a>
</div>
</b:if>
<div class='item-title'><a expr:href='data
ost.href'><data
ost.title/></a></div>
<div class='item-snippet'><data
ost.snippet/></div>
</div>
<div style='clear: both;'/>
</b:if>
</b:if>
</li>
</b:loop>
</ul>
<b:include name='quickedit'/>
</div>
</b:includable>
</b:widget>
<b:widget id='Label2' locked='false' title='Labels' type='Label'>
<b:includable id='main'>
<b:if cond='data:title'>
<h2><data:title/></h2>
</b:if>
<div expr:class='"widget-content " + data:display + "-label-widget-content"'>
<b:if cond='data:display == "list"'>
<ul>
<b:loop values='data:labels' var='label'>
<li>
<b:if cond='data:blog.url == data:label.url'>
<span expr:dir='data:blog.languageDirection'><data:label.name/></span>
<b:else/>
<a expr:dir='data:blog.languageDirection' expr:href='data:label.url'><data:label.name/></a>
</b:if>
<b:if cond='data:showFreqNumbers'>
<span dir='ltr'>(<data:label.count/>)</span>
</b:if>
</li>
</b:loop>
</ul>
<b:else/>
<b:loop values='data:labels' var='label'>
<span expr:class='"label-size label-size-" + data:label.cssSize'>
<b:if cond='data:blog.url == data:label.url'>
<span expr:dir='data:blog.languageDirection'><data:label.name/></span>
<b:else/>
<a expr:dir='data:blog.languageDirection' expr:href='data:label.url'><data:label.name/></a>
</b:if>
<b:if cond='data:showFreqNumbers'>
<span class='label-count' dir='ltr'>(<data:label.count/>)</span>
</b:if>
</span>
</b:loop>
</b:if>
</div>
</b:includable>
</b:widget>
<b:widget id='Label1' locked='false' title='Labels' type='Label'>
<b:includable id='main'>
<b:if cond='data:title'>
<h2><data:title/></h2>
</b:if>
<div expr:class='"widget-content " + data:display + "-label-widget-content"'>
<b:if cond='data:display == "list"'>
<ul>
<b:loop values='data:labels' var='label'>
<li>
<b:if cond='data:blog.url == data:label.url'>
<span expr:dir='data:blog.languageDirection'><data:label.name/></span>
<b:else/>
<a expr:dir='data:blog.languageDirection' expr:href='data:label.url'><data:label.name/></a>
</b:if>
<b:if cond='data:showFreqNumbers'>
<span dir='ltr'>(<data:label.count/>)</span>
</b:if>
</li>
</b:loop>
</ul>
<b:else/>
<b:loop values='data:labels' var='label'>
<span expr:class='"label-size label-size-" + data:label.cssSize'>
<b:if cond='data:blog.url == data:label.url'>
<span expr:dir='data:blog.languageDirection'><data:label.name/></span>
<b:else/>
<a expr:dir='data:blog.languageDirection' expr:href='data:label.url'><data:label.name/></a>
</b:if>
<b:if cond='data:showFreqNumbers'>
<span class='label-count' dir='ltr'>(<data:label.count/>)</span>
</b:if>
</span>
</b:loop>
</b:if>
<b:include name='quickedit'/>
</div>
</b:includable>
</b:widget>
<b:widget id='Navbar1' locked='false' title='Barra de navegación' type='Navbar'>
<b:includable id='main'><script type="text/javascript">
function setAttributeOnload(object, attribute, val) {....ETC
O ESTE OTRO:
</div><!-- /sidebar-wrapper -->
</div><!-- /main-wrapper -->
</div><!-- /outer-wrapper -->
</div><!-- /ct-wrapper -->
<div class='clr'/>
PERO no tengo claro que debo hacer... :s