Once you have a copied image, skip ahead to using it as an icon.
If you’d also like to save a copy to your Desktop, use the same key combination without “control. "
You can change the icon of most folders, applications, and documents. Certain special icons cannot be changed this way, including the Finder and Trash icons. You can change them with the system folder method, or using downloadable software such as LiteIcon (or Candybar for older OS X versions). [3] X Research source
You can also open this window with the hotkey ⌘ Command+i, or the File → Get Info option in the top menu.
This will only change the icon for that specific file, not for all files of that type.
If you think your account should have access, expand the “Sharing and Permissions” section at the bottom of the Get Info window. Change your account name’s permission setting to “Read&Write. " If that still doesn’t work, try copy-pasting a second time, or restart your computer.
/System/Library/CoreServices/CoreTypes. bundle/Contents/Resources/
Alternatively, you can back up your computer and restore it if you make a mistake. If you want to create your own file icons, create a transparent png image. The image should be square, and ideally 1024 x 1024 pixels. Once you have the image, you can use online programs to convert it to . icns format.
