Go in your index.php file and remove this
<div class="feed">
<form action="https://feedburner.google.com/fb/a/mailverify" method="post" target="popupwindow" onsubmit="window.open('https://feedburner.google.com/fb/a/mailverify?uri=feed uri', 'popupwindow', 'scrollbars=yes,width=550,height=520');return true">
<input type="text" class="input" value="Sign Up here for email feed..." onfocus="if (this.value == 'Sign Up here for email feed...') {this.value = '';}" onblur="if (this.value == '') {this.value = 'Sign Up here for email feed...';}" name="email"/>
<input type="hidden" value="feed uri" name="uri"/>
<input type="submit" class="sbutton" value="Submit" />
</form>
</div>
And the PHP code related to the form… I can’t see the php via the source code