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1. Upload check_httpbl.php to the /wp-content/plugins/ directory
2. Activate the plugin through the 'Plugins' menu in WordPress

You can check whether the plugin works by using the following link: configuration test.

Normaly, the Plug-In creates a logfile called httpbl.log in your root directory. If you want to disable the logging option just edit the file check_httpbl.php and change the option $logging from 1 to 0:

• Logging enabled: $logging = "1";
• Logging disabled: $logging = "0";