Theming a node edit Form - Move Author Information to another positon
You can use the Display Suite module.


  Display Suite allows you to take full control over how your content is displayed using a drag and drop interface. Arrange your nodes, views, comments, user data etc. the way you want without having to work your way through dozens of template files. A predefined list of layouts (Drupal 7 only) is available for even more drag and drop fun!