Once you've generated your ad code by visiting the AdSense Setup tab and following the steps to choose an ad type, format, and colors, you'll need to add the code to your webpages. In the final step of the setup, you'll see your code in the Your AdSense Code box. This is the code that you will cut-and-paste directly into your webpages.

Because every HTML editor is different, and because only you know how you like to build your webpages, we can't give exact instructions on copying the ad code into your pages. We can, however, give you a few tips:

Make sure to paste the ad code into your source without making any changes to the code. This is important, as changing the code in any way can cause errors on your page (and is against the AdSense program policies)
Copy the ad code between the body tags of your HTML
If you're using a WYSIWYG editor (such as FrontPage or Dreamweaver) it's a good idea to paste the code into the Code or Source view. Pasting it into the layout view will often result in HTML tags being added to your code, and will result in errors
If your page uses Frames, make sure that the code is pasted into the frame that contains your page's main content. We use this content to target ads
When you're all done, save your webpages and upload them to your server. If you have questions about uploading files to your server, we suggest contacting your web hosting company directly.

Google ads should appear on your pages immediately. Initially, the ads that you see may be Public Service Ads (known as PSAs) and won't be targeted to your page. We have to crawl your page's content before we know what kinds of ads to send your way - this can take up to a few hours, but usually occurs within minutes. Once our crawler has visited your page, you should see ads that are highly targeted to your content.

You might also find helpful HTML hints in the AdSense Help Forum. AdSense publishers share their knowledge and experiences in this forum, where you can feel free to post your own questions and search or browse for answers about ad implementation.