How do I reference a user-made Class Library from a separate project?

I downloaded a sample Visual Studio project called EmailApplication from a website. I extracted the project and opened it in Visual Studio 2008. Then I built it and tried to run it with Control-F5. It gave me the following error:

"A project with an Output Type of Class Library cannot be started directly.

Add an executable project to this solution which references the library project. Set the executable project as the startup project."

I am very new to Visual Studio and I have never used libraries or multiple projects. Do I create a New Project and then how do I reference the project EmailApplication from there?
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Paul JacksonSoftware EngineerCommented:
Class Libraries are designed to be consumed by other project types. As described you would add a new peoject to the solution or add the class library to an existing solution and add a reference to it by right clicking the project you want to reference the class library with and selecting the projects tab and selecting the class library project.
In your new project you would then reference the project using its name ie. EmailApplication.suborfunctionname

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