If you're not well verse with HTML tweaking, don't lose hope as there is an easier way of installing AdSense in your WordPress blog, and that is through AdSense-specific WordPress plugin. Luckily, there are several WordPress-AdSense plugin that you can use to install AdSense on your WordPress blog. Two of the most popular plug ins are - AdSense Deluxe and AdSense Injection.
AdSense Deluxe allows you to run AdSense ad units in any part of your WordPress blog. This plug in even lets you change the style of the AdSense ad units that will be displayed in your WordPress blog. Take note however, that you can also tweak the appearance of the AdSense ads through the AdSense setup. And Google has also issued some guidelines on how AdSense units should be implemented on blogs. So, it is always a good practice to consult these pertinent guidelines to avoid penalties later on.
The other most popular WordPress - AdSense plug in that you can use to install AdSense in your blog is AdSense Injection. This plugin randomly injects AdSense units to any part of your blog posts. This plugin works best with WordPress blog with great and lengthy content and it distributes AdSense units evenly to your blog posts.
Both these plugins provide configuration settings which you need to tweak to effectively run Google AdSense in your blog. But the most important thing that you need to ensure is that your AdSense publisher ID is reflected so that the earnings generated by the ads would go to your AdSense account and not to the default AdSense account specified in the plugin default which is that of the plugin developer.