Sorry, I missed the notification for this when you originally posted it. Are you still having this problem? Mine does show the "edit" button - I assumed that it just always appears for all containers. But if it's still missing for you, I can look and see if I'm supposed to do something specific to enable it.
Support for my Docker template for the restic REST server image.
Application: Restic - https://restic.net
Docker Hub: https://hub.docker.com/r/restic/rest-server
GitHub: https://github.com/jorgenman/unraid-templates