Ok, sorry. I would like forum members to hide any topic of their choice. This is fairly common in forums; I'm surprised I couldn't find it for PHPBB.
Say you can't stand my thread here, and want to make sure you don't see it in future when you visit this board ... I want a clickable option so you can ensure that, on your logged-in visits, this topic does not appear in your view.
It's sort of like a bookmark in reverse.
Is that any clearer? Any ideas?