First, create a new site variable show_feeds by adding a line to the _config.yml file which is in the root folder of the Octopress source.
# RSS / Email (optional) subscription links (change if using something like Feedburner)
+ show_feeds: false subscribe_rss: http://feeds.feedburner.com/zerosharp
# RSS feeds can list your email address if you like
Then modify the source/_includes/navigation.html as follows