Step by step on how to do it.
=>step 1 Login to your blogger account, click on the blog title.
=>step 2 scroll to template, click on it.
=>step 3 click on the check box which indicates expand widget.
=>step 4 now, find this code: <b:include data='feedLinks' name='feedLinksBody'/> for what i know, there is only one of this thing present in the template.
=>step 5 delete the code.
Then, save your template. Check your blog, the subscribe to: Posts (atom) link should have been removed.
P.S. Backup your template incase you get anything wrong.