You must have installed JoomDIY component and a working Google Adsense Account.
In your Joomla backend, go to Components > JoomDIY > Options and click on AdSense tab , then add your AD client ID, and slot ID
As of today, you decide if Ads should be displayed in user profile, in items lists, in search results. The adtype option gives you control about the way Ads should be displayed. The recommended setting is Auto. Please make sure you filled in the AdClient and AdSlot ids, save and you are all set.
If ads are enabled in listings or search results, YooDIY will automatically display an ad at the end of the first line of items.