Changing the PowerCMS' header doesn't require you to be a PHP coder, you can customise the admin pages using css and your own images, background etc just like you can for any page.
Start by simply swapping the PowerCMS logo image file for your own.
Well this would assume that you know what CSS sheet the Editor is using and where the default header image is located. Which I don't. Can you give me a location for the CSS the editor is using? Much appreciated!