qlob, you are quite thoughtful!
Of course a moderator could do the change, but the user would probably have to request it themself.
This is what I suggest....
Although the member may be new, I would recommend them to learn to edit the post. It is useful to be able to know how to edit a post and good for them to learn. Below is how. (Feel free to link to this post if needed).
The user that created the post clicks on the button which will be to the left of the button in the relevant post.
The user then can delete or change anything that they like. Finally, press the "Save" button to save the changes.