If you are using a official blogger template of blogger.com, you can see this "Subscribe to: Posts (Atom)" link below your blog posts. Not only official blogger templates, but also many custom blogger themes include this subscribe link. It helps your readers to get your site updates using RSS feed. But if your blogger theme already has a subscribe link or subscribe button, this "Subscribe to: Posts (Atom)" link not necessary.
To delete this subscribe link, go to "Edit HTML".
Remove above line and save your template.