How do I create a gallery of images?

To create a 'gallery' select the Create content link in the side menu. Select 'Gallery image' as the content type. Enter a Title for the image, enter a name for the gallery, or click one from the list of existing galleries to auto-fill the field. Upload an image and add any text to the 'Image text' field. Submit the Gallery image.

Add all the other images the same way, using the same Gallery name as the first time.