How do you make registry changes ?

[SKS06460]

I've downloaded the PHM registry editor.
Whenever I search for any of the registry edits shown in this forum, I can't find them.
Specifically, all the registry edits start out with a key such as

HKLM\etc\etc\etc

For instance, I'm trying to make the change in this post:

http://forum.ppcgeeks.com/showpost.p...54&postcount=3

I can't find this key:

HKLM\System\CurrentControlSet\Control\Power\State\ Unattended\wav1: = 0

When I open my registry editor, I can navigate to:

HKEY_CURRENT_USER\System\Current\ControlSet\Contro l\Power\State\Unattended...........and then it falls apart.

I can't find the HKLM settings.

I'm obviously doing something wrong, I'm sure it must be simple. I just don't know what it is.

Any help that can be offered would be appreciated.