Board Thread:Versus Battles/@comment-35183820-20170819031709/@comment-26221691-20170821222415

You see the one that says "more", where you click on it and it shows a list of options on a thread such as this. Go to one that says "close this thread" and you have to put in a reason for why you closed it (although it can just be something like a period or a comma as it'll take whatever) and after that, the threads closed.