Step 7: Customizing the Slide Show:

In your zen cart admin go to Tools -> Banner Manager.

Click on the banner "Slide 1", "Slide 2", "Slide 3", "Slide 4", "Slide 5"

Click on the "edit" button

Select "Banner New Window" Yes, or No, Enter your Banner URL in the text box, and Click on the "browse" or "choose file" button and select your image.

Click on the "update" button.

The default slider image size is 550 x 302 pixels.