Help on he app cocoppa for iPhone/ iPod?

Ok so I got this app called cocoppa and it lets you decorate your apps for the iPhone/ iPod. Cocoppa will let me decorate apps that i downloaded off of the App Store but not the apps that came with the iPod when I first got it. The apps that I'm talking about are safari, messages, iTunes, the App Store, and my music. So my question for you is, how do you decorate those apps?

It doesn't directly edit the app. It just adds an icon that shortcut the app. If you want to edit an apps icon for real, Jailbreak. On cocoppa you can't decorate stock apps because you can't make a shortcut link to them