A few days ago some asked about posting to posts from the Old Forum and I did not address the topic at the time.
You can read and search all the Old Forum posts but you can not add to them as they are all locked. If there is a particular thread you want to reserect to the active part of the Forum contact either myself or ChrisB by email with the name of the topic and explain why you want it renewed. As Admin. either of us can unlock the thread and move it to the new Forum.
If this does not answer fully enough the original question, please post a reply restating your original request.