I just removed an INCREDIBLY old and ugly Hollywood light fixture from my bathroom. The wall now looks like the picture below. I bought a box and a Snap Tite connector. I even got a hold of some grounding screws but then quickly realized (DUH) how am I supposed to ground the actual box? I live in an older home and just wanted to update my lighting fixture. Am I really going to have to call an electrician just to do that?
Please help. I am unsure if I am worrying for nothing or if this is a serious issue.
Thank you all in advance!