1. Open up the 'Google AdSense ad formats' page in your web browser.This page shows the formats and sizes for all the different types of ads that Google displays. All of the measurements given are in pixels, which is a standard measurement used in website design.Review these ad types carefully, as there are various types and sizes.
2. Open up the website on which you already display or wish to display ads.Consider the best places to put ads on your site or how to change existing ads given the content and layout of your site. As a general rule, place ads near navigation elements and in prominent positions.
3. Open your Web browser and log on to your Google AdSense account. Your AdSense home screen will appear.
4. Click on the second option along the blue menu bar labelled 'My Ads'.To create a new ad, click the 'New ad unit' button. To edit an existing ad, find it in the list of current ads and click it.Edit your ads to your satisfaction and ad them to your website.