In Safari I opted to disable styles, then aimed to delete the post. This failed.
In Firefox 3.5.2 again with no style I aimed to move (not delete) the post <
http://n2.nabble.com/forum/MoveNode.jtp?node=1596087>, Nabble responded:
> Security – You Cannot Move This Post
>
> Sorry, you can't move this post.
> You can only move posts that are descendants of posts or forums that you own.
> Please contact Nabble Support if you need help.
In Firefox I opted to delete the message, this led to a prompt to log in, I did so then the message was successfully deleted.
I guess that the issue related to embedding, I maybe overlooked (or the embedding style could not present) the option to log in.