Once you upload a collection of photographs to your website, you can add them to a collection, such as a recent fundraiser, or "black dogs," or really, anything you like.
You can enable the Photo Gallery feature on the Admin > Settings > Web Site page. You can add a gallery by going to More > Photo Galleries.
On the Photo Gallery web page you can delete existing galleries, or click edit to rename a gallery.
To add a picture to the Photo Gallery, click the Add a Photo link next to the appropriate gallery.