Steps to Remove Subscribe to : Posts (Atom) Link from Blogger :

Log into your Blogger account, move on to "Template" option and click the "Edit HTML" button.

Click anywhere inside the code area, then press the CTRL + F keys to open Blogger' search box.

Find the following line in HTML area: 

<b:include data='feedLinks' name='feedLinksBody'/>

1. Remove the above line carefully and click on the "Save Template" button to save the changes.