If u r talking about adsense code then login into ur adsense ac http://www.google.com/adsense and get ad code > when u will generate ad then at the end of the wizard u will get ur code. But if u are asking for adsense plugin then there are many, some best / top are. adsense manager adman all in one adsense and yahoo Go to wp plugin dir and download these plugins. Hope it will be help