How to install a plugin?

I recently downloaded SocialConnect plugin from: https://github.com/nokia-developer/social-connect-qml-plugin The problem is I have not idea how to install it/use it.. I opened a example project and it says “import SocialConnect 1.0” but is underlining with red, and I can’t compile.. I am using Win7 Compilation says: “module “SocialConnect” is not installed import SocialConnect 1.0”