The quickest and easiest way to implement Kontera  ads on your WordPress blog is by using the Kontera WordPress plugin.  

Download Kontera-WordPress Plugin for WP 2.8
Download Kontera-WordPress Plugin for WP 2.7
Download Kontera-WordPress Plugin for WP 2.6

If for some reason you cannot use the kontera plugin, please follow the guide below:

1. Login to your WordPress Administrator, and select the "Presentation" tab.
    
2. Choose the "Theme Editor" Tab, and locate the "footer.php" on the file menu displayed on the right side of the screen.
    
3. Open "footer.php" file for editing and insert the Kontera code right before the closing BODY tag "</body></html>".
   

   

4. Save the edited file to your site and Kontera ads will appear 24 hours later, when the tag goes live.