http://everythingoutthere.izfree.com/2009/02/add-adbrite-or-adsense-to-wordpress/ See the post on how to do it manually. Its easy and just as fast as using plugins
Hi there again... I worked out that you cannot put ads into a free wordpress website so then I uploaded a worpress template to a paid host and started from there. I simply went into the wp-admin where you see all the options then went to edit the code. If you go to the single post page...sometimes called the single.php and after this code: <div class="post"> <h2 class="postTitle"><a href="<?php the_permalink() ?>"><?php the_title(); ?></a></h2> Code (markup): Paste your adsense code straight after this...It will place ads under the post title on each page...
go to the editor under themes nd edit the hear footer and sidebar files. make sure not to add too many ads
use adsense manager plugins for ur wordpress it fetch out all ad layers and you can place it anywhere.