Issues with Changing OS X Icons

[Gwaredd]

I've looked at several posts and viewed a few YouTube vids on how to change icons in OS X. I'm running Mavericks 10.9.1 and despite my best efforts I cannot get them to change.

I follow the proper procedures making sure that my system privileges have been unlocked and I get this:

Any suggestions?

 

[GGJstudios]

How to change the icon for any disk, app, file or folder

 

[Sital]

If GGJstudios link doesn't help you, then we're going to need more details on exactly how you are going about trying to change the icons.