Can't find OS X installation Partition

[fleshold]

Okay so I know this will sound kinda awkward but I managed to install OS X Mountain Lion on the following configuration:
i7 3770, H77 DS3H Gigabyte Motherboard, Nvidia GTX 560 TI. I didn't use onboard LAN, I used tp link 3269 by Gigabit which has native support in Mountain Lion. Now I just want to add PCIRootUID=0 in the extra folder on my mac partition problem is that I can't see my mac partition in Finder and I can't reach the extra folder. I know this sounds funny, but I'm not very familiar with Mountain Lion interface I just used Snow Leopard and older versions where it was so easy to find the boot plist and edit it. How can I find my OS X partition so I can edit the boot plist?

 

[Pakalolo]

"Click" Finder or any where on the desktop. On the toolbar at the top, go to Go/Computer and you will find it there.

 

[fleshold]

In case some of you people bump into this... the solution is go to Disk Utility select the partition with OS X installed, right click on it and reveal it in Finder... Kinda curious situation in Snow Leopard it was always prompted in Finder, this new addition was added in Lion.

 

[Pakalolo]

Yes, you can do that as well. If you want the start up disk to show up at all times in Finder under Devices, do what I posted and instead of double clicking the start up disk at the end, drag the start up disk to Devices and it will be there every time you open Finder.