The article provides a step-by-step guide on how to customize users in a Symfony 3 project using the FOS User Bundle. The process involves expanding the user entity, creating getters and setters for new attributes, updating the schema, overriding forms, and modifying templates to include dynamic content. By following these steps, developers can add custom attributes to their users, such as phone numbers, and incorporate FOS User forms and pages into any Twig templated project.