Help for grounding a ballast

Hi!
Recently I bought a used ballast but I see now that's not grounded (although I asked )..

I don't know much on how to do it (first time trying to grow), but I know that I want it grounded.

Here are some pictures, can someone please explain how to do it?

If more data or pictures are needed just say it

Thanks in advanceView attachment 4547208View attachment 4547209View attachment 4547210View attachment 4547211View attachment 4547212View attachment 4547213View attachment 4547214