There isn’t an admin page for editing a post archive page of any kind. I’ve long felt that this is an over-site, but not one that will likely be corrected any time soon since.
At any rate, the only way to have a way to edit items to show directly on these archive pages is to use an ACF Options Page. This requires either an add on or ACF Pro. Set the options page parent to the admin for the post type. Now create fields for this options page that you can get/show on the archive.
