If the colors aren’t from the image you selected, go back to the color mapper page, check the colors in step 1, then click the go button. Upon return to this page, the colors should be updated (browser caching may have to be cleared).
Please remember this is a very simple demonstration. The idea is to show how you can take an image and the color attributes to update CSS files. This isn’t intended to be a user-friendly wizard. It’s a powerful tool, and may take some time to understand and appreciate.