I want to delete a thread that I created on this forum. I followed the instructions at How do I create, reply to, edit or delete a thread?, specifically the following:

If you click "Go Advanced" located on the bottom right in the "Quick Reply" box, a page where you can enter a title and additional options will be displayed. You can reply to a thread through the page.

- Deleting or editing a post
Once you have logged into the forum, locate the post you wish to edit and then select “Edit Post” on the bottom right of the post. Once you have selected “Edit Post,” the editing page will appear. From here, you can edit your post and then select “Save” to update your post. Please note that the title of the post cannot be edited.

If you wish to delete a post, select “Edit Post” and then select “Delete” once the editing page appears. If you would like to include a reason for why you have deleted the post, check “Delete Message,” enter your message of choice and then select “Delete Post.” If you do not want to include a reason, simply check “Delete Message” and then select “Delete Post.”

Please be aware that if you delete the first post of the thread, you will delete the whole thread as well. Make sure to take caution when deleting a post.
When I click "Go Advanced" on the first post of my thread that I created, there is no "Delete Post" option. I've reported the first post of my thread asking for it to be deleted several times late last year, but it hasn't been deleted by the moderators.

How can I have the thread that I created deleted?