Feedburner is a free, Google-owned service that provides great feed statistics and services to bloggers and other feed publishers.
Open theme search.php and add the following code before get_header(); line:
Following the last free icon set, this one is more simple, but features more icons and is more complex. Downloading this file, you will get fully editable PSD source with all shapes as Vector Smart Objects (from Illustrator). So you can deconstruct them,