What is Adsense? Well, AdSense is an advertising program run by Google. Website owners can enroll in this program to enable text and image advertisements on their sites. These ads are administered by Google and generate revenue on a per-click basis. Google utilizes its search technology to serve ads based on website content, the user’s geographical location, and other factors. Those wanting to advertise with Google’s targeted ad system may sign up through AdWords. … Now, back to the free version of Wordpress and web hosting Wordpress, you have readily available ‘plug-in’ for adsense related codes, which make it easier for you to load the script. HOWEVER you only have the option to load the plug-in ONLY when you have loaded the wordpress into your own web server. (the ‘org’ version)This has been discussed many time in WP forum e.g. below.. Extracted from: http://en.forums.wordpress.com/topic.php?id=1040&page&replies=3#post-5179 Question: I signed up for a free account at wordpress.com. My problem is that I don’t have a PLUGIN tab whenever I go to my ADMIN page. I found my PLUGIN KEY, I just can’t find my PLUGIN tab. My question is, does a free account at wordpress.com NOT include a PLUGIN tab in the ADMIN page? Or do I need to look for it elsewhere? Also, when I view my blog on a Mac with Safari and click on the image thumbnails, Safari downloads the picture onto my desktop instead of viewing it on the browser. Is this a problem with Safari or is there an option in the wordpress editor that I can use or something that I can do to fix the problem? Answer: You don’t have access to plugins on the hosted version of WordPress. Plugins are available only when you download and install the WordPress engine on your own. The hosted version of WordPress uses a version of WordPress called WordPress Mu - it’s WordPress but an optimised version that allows many people to the same server. This version is different in many ways: Themes use the Smarty Templating Engine (for performance) Themes are shared - the theme files exist in only one place and are available for everybody The actual code (php in this case) exists in one place and are shared for everybody. Magic and fairy dust make it look like there are separate pages for everybody. Because everything is shared - implementing plugins is very difficult - as many plugins aren’t savvy about the differences in WPMu. The same reason applies to templates - each template has to be changed manually to support the Smarty Engine. As this is done by the devs - it takes time. The time they spend on changing templates - is less time to fix bugs and to improve the code.

Seems that I can’t do it today then, since I’m migrating my account from Windows based to Linux based, and there’s a downtime as well during the transition, sigh…