If you're looking to remove a subscriber from your list, here's a quick guide on how to do it:
Head over to the 'Marketing' tab and click on 'Contacts'.
Browse through your contacts and click on the subscriber you'd like to delete.
A profile pane will appear on the right side of the screen. Here, click on 'Full Profile' at the top.
Scroll down to the bottom of the full profile view, and you'll see the 'Delete Profile' option.
Click that, and you're done!
I ran into this same issue before and didn't find an answer here, so I thought I'd share the steps that worked for me. Hope this helps you out!