I had a member delete his reply to a post, this deleted all of the replies to his reply. I don't want members of my forum to be able to delete their posts and replies, how do I set this option?
Sorry, we don't have this option. Nabble believes that a post belongs to its author, not to the associated forum. So authors have the right to delete anything they have created. Also, when a user deletes his/her post, replies are not deleted. They just lose the connection with the thread. So you can still find those lost replies under the profile of their authors.