I have an iContainer, now how do I change my system icons?
An iContainer is a package of icons, ready to use. Double click an iContainer to import the icons. Then, if the iContainer has any built-in system replacement icons, a Use These Icons button will appear in the collection header — click that button to set the system icons automatically. Now, click Apply Icons, and you’re set! If the Use These Icons button is not enabled, the iContainer may not have any system-tagged icons. That’s OK: you can still drag and drop icons up into the “Change” area one at a time. (You can also, as always, drag icons from the Finder.) Once you’re happy with your icons, just hit Apply Icons.