I bought Microsoft Office 2013 few months ago but now I need the Snipping Tool program and it is not available.
The Snipping Tool is an application embedded into Windows operating systems. You can access it using Start > Search > Snipping Tool. It doesn't have any connection with the Microsoft Office application.
You can check how to use the application using the following link: http://windows.microsoft.com/en-us/windows/use-snipping-tool-capture-screen-shots#1TC=windows-8