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Note: As is the case when installing any new plugin, it's always a good idea to backup your blog data before installing.

1. After downloading the Update Unique Keys plugin, unpack and upload the file to the wp-content/plugins folder on your blog. Make sure to leave the directory structure of the archive intact so that all of the Update Unique Keys files are located in 'wp-content/plugins/updateuniquekeys/'
2. You will need to activate the Update Unique Keys plugin in order to update your wp-config.php file. Go to the Plugins tab and find Update Unique Keys in the list and click Activate.
3. After activating proceed to the plugin settings page (under Settings > Update Unique Keys) to update your keys and wp-config.php file.
4. You will be automatically logged out, due to the keys changing, simply re-login with the same username and password.