To get started, click the Add Content button.
Select the Image Thumbnails widget from the Widget menu.
Click the Add Images button.
Next you can select images already uploaded to your site, or you can import new ones using the Upload Image button. Select all the images you wish to be displayed and click Done.
Here you can rearrange the order of the images you’re using. Click Save when finished.
Once displayed on your website, click the arrows to either side of the widget to scroll through your image thumbnails. Alternatively, click on the image for a full-size view.
For more help, view the video below: