Dejan, send this to email@example.com.
Wish I could mark your answer :)
On my account, I currently have "Mark answer" on all the replies in this thread (including my own). Might be a permissions issue with your account. (I'm moderator).
Could be. I've got a reply from epw that this is a known issue. It is supposed to work in Chrome but not in other browsers. I'm using Chrome and I don't see the button.
Other users have reported the same problem. For example http://world.episerver.com/Modules/Forum/Pages/Thread.aspx?id=174268
Started happening in the beginning of January.
I don't see the Mark Answer button for other people's posts. I'm only allowed to mark my own posts.