Ok it's not too hard, but some investigation is required.
Lets say you have an 'About' page and you have added the 'Meta' widget to the sidebars, but you don't want it to be displayed on the 'About' page.
First you have to find out what page id the 'About' page is. Go to the WP dashboard and select pages. When you put your cursor over the 'About' link, you will see the page id in the address bar at the bottom (if you are displaying them). You can also go to the front end and go to the page in question and look at the HTML address. It should end in a number, this is the page ID. In this example we will say it is '2'.
Next we need to find out the ID of the widget in question. If you view the source of the page you need to look thru till you find the left or right sidebar (depending on where the widget is) and then you will see something like this
HTML Code:
<!-- Right Sidebar -->
<td id="right">
<div id="meta" class="widget widget_meta"> <div class="widget-title"><h3>Meta</h3></div><div class="widget-content"> <ul>
<li><a href="http://192.168.48.99/~paul/zenofmud/wp-admin/">Site Admin</a></li> <li><a href="http://192.168.48.99/~paul/zenofmud/wp-login.php?action=logout&_wpnonce=4c3f0aa1d6">Log out</a></li>
<li><a href="http://192.168.48.99/~paul/zenofmud/?feed=rss2" title="Syndicate this site using RSS 2.0">Entries <abbr title="Really Simple Syndication">RSS</abbr></a></li>
<li><a href="http://mydomain.com/?feed=comments-rss2" title="The latest comments to all posts in RSS">Comments <abbr title="Really Simple Syndication">RSS</abbr></a></li>
<li><a href="http://wordpress.org/" title="Powered by WordPress, state-of-the-art semantic personal publishing platform.">WordPress.org</a></li>
</ul>
</div></div><div id="archives" class="widget widget_archive"><div class="widget-title"><h3>Archives</h3></div><div class="widget-content"> <ul>
<li><a href='http://mydomain.com/?m=200905' title='May 2009'>May 2009</a></li>
<li><a href='http://mydomain.com/?m=200904' title='April 2009'>April 2009</a></li>
<li><a href='http://mydomain.com/?m=199911' title='November 1999'>November 1999</a></li>
</ul>
</div></div>
</td>
<!-- / Right Sidebar -->
in this case we look for the Meta Widget and find id="meta". Now we have what we need.
go to ATO-> HTML/CSS Inserts -> CSS Inserts and add the following
HTML Code:
#body-page-NN #XXXXXX { display:none; }
where NN is the page number and XXXXXX is the id of the widget, so in this case it would be
HTML Code:
#body-page-2 #meta { display:none; }
and that should be it. Now whenever page 2 is viewed, the META widget won't be displayed.