Goto LAYOUT < EDIT HTML . Then using browser`s search feature [CTRL+F], search "Posts rss".
browser will search and highlight the following code: 

<div id='pagenav'>
<ul>
<li><a expr:href='data:blog.homepageUrl'>Home</a></li>
<li><a expr:href='data:blog.homepageUrl + &quot;feeds/posts/default&quot;'>Posts RSS</a></li>
<li><a expr:href='data:blog.homepageUrl + &quot;feeds/comments/default&quot;'>Comments RSS</a></li>
<li><a href='#'>Edit</a></li>
</ul>
</div>


The links are separated by <li> tags that start with <li> and end with </li>. You can add/edit/delete the link lists now.