On the Subscribe page that makes you subscribe to comments without posting, a link is shown in the "Recent Posts" widget that says "Manage subscriptions" and links to /comment-subscriptions/ . This link shows instead of the Recent Posts links.
You can see that on my site here (takes you directly to the subscribe page of a certain post):
I have also tested this on an offline WP site with only this plugin activated and with WP default theme. It does the same thing for Recent Posts widget.