I don’t know why there is no search box, but I have discovered that I can use the “s” query string parameter to search this blog hosted by WordPress, which is handy because I haven’t figured out how to add a list of all the posts. For example, to search for paging:
https://deliverystack.net/?s=paging
Update: I found the search box. You have to set s to something that does not appear on the blog.