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For iTunes:
Follow these instructions from Apple to log out of iTunes.
For iCloud
- Click on the Apple menu (top left of the screen).
- Select System Preferences.
- Click the iCloud panel and then Click on Sign Out.
For App Store
- Locate your Applications folder.
- Open the App Store.
- Locate the Store menu at the top of the screen. Click on sign out.
OR
- Click on the "Featured" tab.
- Click on account.
- You will see an option to sign out; click on it.