To delete a question or comment from the developer zone, you need to contact National Instruments.
Some requirements for deleting a comment or question:
1) You must have been the original author of the question and/or comment.
2) You need to either call or email in a request with a specific url where the comment and/or question is located.
3) You must have a "legitimate" reason for deleting any comment or question.
If these requirements are satisfied, one of our websupport engineers would then be able to delete the respective question or comment.