efaq: Using Customize

 
 5.2 How do I start using Customize?
 ===================================
 
 The main Customize entry point is ‘M-x customize <RET>’.  This command
 takes you to a buffer listing all the available Customize groups.  From
 there, you can access all customizable options and faces, change their
 values, and save your changes to your init file.  See(emacs)Easy
 Customization.
 
    If you know the name of the group in advance (e.g., “shell”), use
 ‘M-x customize-group <RET>’.
 
    If you wish to customize a single option, use ‘M-x customize-option
 <RET>’.  This command prompts you for the name of the option to
 customize, with completion.