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Description of problem:

http://documentation-stage.bne.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6-Beta/html/Deployment_Guide/preferred-os.html

In section 4.9.1. Setting a Sticky Release Preference in the GUI

 2. Select the Preferences icon in the upper right corner of the window. 
               ^^^^^^^^^^^
change to      System Preferences

The hover help for the referenced icon is "System Preferences"

Changed the button text:
http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Deployment_Guide/preferred-os.html