From what's been written so far, it looks like the way to delete a merged post is to ask a question on meta, and then a <del>tiny dinosaur</del> mod will kindly delete it for you.

However, for the sake of future readers, what's probably the better way to do this is **flag the post for moderator attention** by clicking the small **flag** link under the post, like so...


[![enter image description here][1]][1]

  [1]: https://i.sstatic.net/H1Xho.png