Replace "Subscribe to: Posts (Atom)" With "Subscribe to: Posts (RSS)"

1.Log in to your dashboard--> layout- -> Edit HTML

2.Click on "Expand Widget Templates"

3.Scroll down to where you see this code:

<b:includable id='feedLinksBody' var='links'>
<div class='feed-links'>
<data:feedLinksMsg/>
<b:loop values='data:links' var='f'>
<a class='feed-link' expr:href='data:f.url' expr:type='data:f.mimeType' target='_blank'><data:f.name/> (<data:f.feedType/>)</a>
</b:loop>
</div>
</b:includable>

4.Replace above with below code.

<b:includable id='feedLinksBody' var='links'>
<div class='feed-links'>
<data:feedLinksMsg/>
<b:loop values='data:links' var='f'>
<a class='feed-link' expr:href='data:f.url + "?alt=rss"' type='application/rss+xml' target='_blank'><data:f.name/> (RSS)</a>
</b:loop>
</div>
</b:includable>

5.Now save your template and your done.