To use Photoshow, there are three main steps:
1. Add photos by choosing images from your library and uploading them.
2. Personalize the photoshow by choosing a style, music, editing photos using various tools, and adding captions, bubbles, stickers, borders and a title.
3. Share the completed photoshow by posting it on Facebook, emailing the link, or adding it to a webpage. The document provides detailed instructions for customizing the photoshow within the personalization step.