In edit mode, select this sub-stack and access its settings in the Page Inspector. Create a link to the scaled thumbnail image (for use in the thumbnail grid) and a link to the larger image, for display within the lightbox. A title and some caption content for your image can also be supplied. For best results, use JPG, PNG or GIF images saved at 72 dpi. You can use images attached to your RapidWeaver project as resources or link to images that are already stored online.