Looks like you have quite an old version of the theme running (1.1 – the current version is 1.4). The current version disables the RSS feed icon by default and provides option to specify the rss-feed url if you really want to include one.
Anyway, if you want to not display it on your site, pls insert the following CSS into Custom CSS tab in the Theme Options panel or the
.social-container li.rss-feed { display: none;}