Locating .hdd file in order to add existing hard disk

I've had a hard disk problem with Parallels not opening since updating to El Capitan. I searched around here and saw some similar problems and what looked like a solution to my problem. The solution entailed going into the hardware settings and deleting the hard disk listed there and then re-adding the existing hard disk again. My problem is when I go to add the "Existing image file" I can't locate the file path of the existing hard disk. I can see all of the folders and applications for Parallels and Windows on my Mac, but I guess I'm not sure exactly what I'm looking for when looking for the file path. This is what I'm trying to follow. I'm using Parallels 10.3.0.

 

Anyone? The virtual machine is useless on my Mac right now and I am stuck - not sure where to go for help if I can't find it here for this problem.