The order in which photos appear on a business page (including the main photo) is determined by different factors, such as votes from the community and how recently the photo was taken. We also automatically disperse any available videos of the business throughout the photos. You're welcome to add additional photos to your business page, but we don't offer the ability to re-order photos with a free business account.
However, we do offer advertising packages that enable you to set the order of your photos in a slideshow (but currently videos are still automatically dispersed throughout your ordering). If you're interested in an advertising program, please contact our Sales team.