Handbrake problem

I have just installed Handbrake and launched it. It tells me that libdvdcss is missing. I have downloaded libdvdcss but have no idea on how to install it. I figured out that it needs an app called Git which I have downloaded and installed, but still have no idea what to do next.

Upon installing Git, it has not put an icon in my Apps folder nor in Launchpad so I do not know how to use it.

Please help, thanks.