New users are presented with a “delete button” for their posts, but when they click on it a message says “You don’t have permission to delete this topic. If you really want it to be deleted, submit a flag for moderator attention together with reasoning”.
But there is no flag button either. I think new users should be able to at least flag their own posts, or the message should be updated.
Related to How do I flag a topic? - Site Feedback - Let's Encrypt Community Support and TEST message for flag/delete - Site Feedback - Let's Encrypt Community Support