This plugin adds wordpress comments validation to the Wordpress comment form. only need to activate the plugin than validation is working.
This plugin is the most powerfull plugin which easily put the validation on your wordpress comment form.
This plugin is compatibile with other plugin.
In this plugin need to only activate the plugin.
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Extract the zip file and just drop the contents in the wp-content/plugins/ directory of your WordPress installation and then activate the Plugin from Plugins page.