To edit the image:

On the module menu, click Edit Image Options (Figure 1):

Figure 1 - Edit the image

On the Image Settings page (Figure2) set the following settings as needed:

Link Type - What type of link content do you want to link to.
      URL - Display an image on another website. Click for instructions.
      File - Display an image file uploaded to your site. Click for instructions.

Alternate Text - Text that will be displayed by browsers that do not display images.

Width - Enter the width (in pixels) only if you need to change the images size.

Height - Enter the height (in pixels) only if you need to change the images size.

Once all values have been set click on the Update link located at the bottom of the page.

Figure 2 - Image Settings