Telerik OpenAccess ORM uses a post-build step injecting code in your model assembly providing the persistent capability, change tracking and lazy loading functionality.
This is achieved by a tool called OpenAccessEnhancer and in order to consume the enhanced project you need the Telerik.OpenAccess and Telerik.OpenAccess.35.Extensions assembly references in your MVC project (as well as in any other project consuming your model).
Here you could find the full configuration for consuming Telerik OpenAccess ORM Fluent Model.
Regarding an example of Telerik OpenAccess ORM - I suggest you take a look at the end-to-end examples in the OpenAccess Samples Kit and especially its ASP.NET MVC section. You could find the recommended approach for the UnitOfWork, Repository and Service patterns implementation in the AJAX With Data Annotations sample application.