I think I found how you're supposed to mark it Answered/NMI but it doesn't work for me:Yes, but the Edit button for AF Contributors (or any staff) is MIA. Without that, threads cannot be marked NMI, Answered, or CFR.
1. Click Thread Tools at the top of the page.
2. Click Edit Thread
3. Click Support next to the title
4. This brings down a menu with the Answered and Need Info options, but I can't choose them. In fact I can barely see them because the menu is transparent.