In order to be able to manage your projects’ packages, you need the NuGet Package Manager. This is a Visual Studio Extension, explained in the official docs: Installing and Updating NuGet Client.

Starting with Visual Studio 2012, NuGet is included in every edition, and can be used from: Tools -> NuGet Package Manager -> Package Manager Console.

You do so through the Tools menu of Visual Studio, clicking Extensions and Updates:

This installs both the GUI:

• Available through clicking “Manage NuGet Packages…” on a project or its References folder

And the Package Manager Console:

• Tools -> NuGet Package Manager -> Package Manager Console.