Aside from Subscribe to Posts (Atom), there is also another one called Subscribe to Post Comments (Atom) that is present below the comment box on every posts of your blog. To remove it, follow these steps:
1. Go to Layout ~ Edit HTML
2. Find .feed-links
Once you found it, it's entire code will look like
.feed-links {
clear: both;
line-height: 2.5em;
}
clear: both;
line-height: 2.5em;
}
Now change it to,
.feed-links {
display:none;
}
display:none;
}
3. Save your template