How do I mark a question as answered on QATO?

I have an old question which I wish to mark as answered. I cannot find the “tick” on any of the answers to actually mark it as answered. I’m sure this is me just being blind and not a bug…

Well just to confirm and for closue to this question - the QATO team have now resolved this and the tick button appears in the correct place.

Click the checkmark below the up/down vote buttons.