Keep Windows Server 2012 R2 from logging you off whenever you leave it be for a few minutes???

Well, this and this suggested:

1. type "regedit" while running Powershell (probably best to do so as Administrator) to bring up the "Registry Editor" dialog box
2. navigate the "folder structure" of sorts at the left navigation to "8EC4B3A5-6868-48c2-BE75-4F3044BE88A7" inside of "7516b95f-f776-4464-8c53-06167f40cc99" inside of "Power Settings" inside of "Power" inside of "Control" inside of "CurrentControlSet" inside of "SYSTEM" inside of "HKEY_LOCAL_MACHINE" beneath "Computer" and then right click on "Attributes" in the right pane to pick "Modify..." to change "Value data:" from 1 to 2
3. type "Control Panel" at the search at the charm bar to bring up the "Control Panel" dialog box
4. change the "View by:" menu at the upper right to "Large icons"
5. pick "Power Options" and then "Change plan settings" by "High performance" and then "Change advanced power settings" on the other side of that
6. in the "Power Options" dialog box which appears expand "Display" and then expand "Console lock display off timeout" and right click on "1 Minute" to change the value to zero minutes

 
 

...but I found myself unable to change the setting! Instead if I pick "Change settings that are currently unavailable" where I might otherwise pick "Change advanced power settings" I can set the "Turn off the display:" setting from "15 minutes" to "Never" ...and yet that seems NOT to do the trick. Grrr. I don't know what to do.

Addendum 4/20/2015: This actually worked just fine. I don't know why it seemed not to work at first. Maybe I needed to restart or something.