As you aware Feedburner now owned by Google. Now you can earn money by Google adsense for feeds. Google attaches ads to to your feed. So who reads your feed thay will also Google ads and you can earn money if they clicks.
For that first you need to optimize your blog so that you blog rss feed can be taken care by Feedburner. I found this plug-in very useful as nothing to do from your side except activate plug-in. No need to modify template,.htaccess files etc…
So visit Feedburner site and setup feedsense ads 
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i had optimized and done everything but no ads are appearing in my feed
what to do now