How Do I Fix This

Ok, school me on this.
I understand that a porta power is a hydraulic cylinder jack. I've never used one though. How would I "jack the narrow side out"?

He’s telling you to just push the quarter panel out. If that was the issue it might be part of the solution, but pushing the quarter that far would total your paint and bodywork.

And it’s premature, because at this point you don’t know that the quarter panel is even the issue. You could push the quarter and still be driving down the road sideways because the rear axle is shifted.