A lightbox image is one that appears as a pop up when you click on the image. It is usually employed to show a wider or larger version of the first image. To set up a lightbox image you need to follow these steps:
Scroll down to the Create your website section and click on the Website Builder icon.
Click on the Login button next to the relevant package.
In the Design view use the mouse to click and highlight the image you want to use a lightbox. Click the settings option.
In the Image menu that appears at the bottom of the page you will see an Lightbox Image box. Drag the image you wish to appear in the lightbox from the left hand image menu and onto the Lightbox Image box.
Your lightbox image is now set-up. You can check the look of the lightbox using the Preview option from the top left of the main window.