SharePoint application using Mac Book

Hello,
I own a Mac book 10.5.8 and I want to start making use of the SharePoint application which, to my comprehension, was once called Groove. I would like to know what I can do to possibly change the settings on my Mac book so as to enable it to function with SharePoint.
I do not have a sound knowledge about computers nor their operations and therefore I request that you use terms that will be easy for me to understand when you reply and please elaborate on this matter further..
