Is there something like this?
I just noticed the "saved: 7" in my profile. And my guess was that this is a list of Comments I upvoted. I tried by upvoting a random Comment. And it seems to work. But how do I get rid of it again? Or in other words - how do I downvote? Or more generally: How do I find out how to do stuff?
The same way you do on an iPod: try things.