1. Complete Google's online AdSense application form. Provide information about the website that you want to run ads on and what kinds of ads you agree to run. You will also need to decide if you are applying as an individual or as a business and provide payment information. Google will then review and approve your application.
2. Log in to your AdSense account at google.com/adsense and select the AdSense setup tab. From there, select AdSense for Content and advance though the steps to create your code. At the end of the process, copy the code provided.
3. Paste the code into the body section of your website. If you are using Dreamweaver, paste the code into your site using the code view. If you are using WordPress, many themes have built-in widgets for AdSense. If your theme does, paste your code into the WIdget.
4. Save and upload your website. The ads should appear once the page is uploaded, but it may take a few hours for the ads to be targeted to the content on your site.