The download comes with a website full of examples on how to use it. If you want to integrate it into your project copy the DLL from the bin folder and put it into your project.
View the example website
NOTE: To run the example website on your computer, you must copy your developer ID from YouTube and replace "YOUR_DEVELOPER_ID" in the the web.config file with your ID.
The component and example site were both written in Visual Studio 2005 using C#. It can also be used with VB.NET sites and Windows applications.