Your forum and posts can be found here:
http://n2.nabble.com/user/UserRootNodes.jtp?user=232087I see that you have an empty forum called "Book Forum". If those orphan topics belong to that forum, you can move them under the forum (open the topic and click on "Options > Move topic to..." and then paste the link to the forum).
When you finish moving your threads, you can embed your forum again in your website (click on "Options > Embedding options" to get the code)
Please let me know if you have any questions, comments or concerns.