When I paste the code it says that I have to put somethig like www.example.com but all my ads are long codes
The Href field is for a URL (ex: http://www.example.com). AdPlugg does have the ability to serve AdSense ads at this time. This functionality is currently under development however and should be available soon. You can vote on the feature here: https://www.adplugg.com/support/feedback-and-ideas/integration-with-goog...
EDIT 2015-09-12: You can now serve AdSense ads using the AdPlugg Custom ad format. See the blog for more info https://www.adplugg.com/blog/new-ad-formats-released.