How to unsubscribe a thread on this forum

I can't turn off the subscription either to whole the forum nor to the topic I responded two years ago. It's annoying, I mean okay but there's supposed to be 'unsubscribe button in the bottom of a page' and there isn't. So I get updated every once in a while having few e-mails and no possibility to unsubscribe from the level of e-mail as it should be. I don't really want to delete my account just because of that so do something with it if you can

EDIT: k forget it, I've just found it under the ACTION button