Can not find field_image(image) in drupal 7.24
An image field will only appear as an "existing field" if it has already been defined for some content type.  The tutorial you're following assumes it does exist.  It look like this is not the case in your configuration. By default, the standard Article content type has an image field.  You may have removed it, or deleted the Article type.

If there is no existing type with an image field, you need to add it as a new field, as shown below:



If no Image field appears in this menu, you may need to enable the core Image module. To do so, navigate to: Home » Administration » Modules. Then locate the Image module in the core sectio, make sure there is a tickmark next to it, and click Save configuration.