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1. Upload the control-live-changes directory into the /wp-content/plugins/ directory
2. Activate the plugin through the 'Plugins' menu in WordPress
3. If necessary, define constants in wp-config.php to override the plugin defaults - see the Description for details.

NOTE: Instead of the above, you may want to drop the control-live-changes.php file into the /wp-content/mu-plugins/ directory to ensure that no one deactivates this plugin!