1.Go to your Feedburner account and make Email Signature and copy its code.
2. Now just login to your Yahoo account,yes you heard it right yahoo account.
3.Now go to its option and configure the signature and put your feedburner email signature code in yahoo signature.(Dont forget to mark HTML option in yahoo.)
4. Now you have to send a mail to your gmail account in which you want to put your Email signature.It will appear as this image
5.Now when you check your Gmail account you will find this mail and w'll see that the signature from yahoo that they have a live feed of your Website.
6.So that it, Now you can use this Email to send to other People who you want to see your feed or to everyone you Mail.it will look like this.
So now you can send your Feedburner Email signature to everyone and they can easily subscribe to your posts