1. From the Apple menu  in the corner of your screen, choose System Preferences.
  2. In the System Preferences window, click Software Update.
  3. Choose "more info" to upgrade to a different version of the current OS. 
  4. Select the Version you wish to upgrade to
  5. If the device prompts you for an admin password, please dial 777 from a school phone and we can remote in and assist you. 
  6. The OS upgrade will download, which takes several minutes.  Then you will begin the steps of installing it.  
  7. Follow the onscreen prompts.