- Upload the files to wp-content/plugins/wp-denyhost/
- Activate the plugin
- On your WordPress blog, open the Dashboard
- Go to Plugins->Install New
- Search for "wp-denyhost"
- Click on install to install WP-DenyHost
In Settings -> WP-DenyHost, set the threshold and response. Default threshold is 3, default response is 403 Forbidden.
If you have a CloudFlare account, you can enable CloudFlare and spammers will be added to the CloudFlare Block list