Unlock a forum post

Hope this is the right right place to post this folks as I can't seem to find the answer anywhere. Was engaged in a discussion I started on the forums. Anyway a few days went past as I investigated various options given to me by others on that post. Now there's no reply option anywhere so I assume the thread is now locked (which is really annoying). How do I get it unlocked as the issue is still an issue under discussion? Thank you.