WP-Gatekeeper adds an easily-answered challenge to your comment form. This defeats automated comment spamming. You can add your own challenges throu …

Noted That:

To install correctly this wp-gatekeeper.zip.
Fisrt Download the wp-gatekeeper.zip to your computer
Extract/Open wp-gatekeeper.zip to Your Computer.
Then, Find readme.txt file inside wp-gatekeeper.zip and Open readme.txt.
Now, Read the Requirements of this plugin. Which Wordpress Version and PHP Version are required to run this Plugin in Your Wordpress Site.
Then, Follow the the Tips Below.

Start the Tips:

1. First Download "wp-gatekeeper.zip" Plugin to your Local Computer. (Click Download)

2. Then, Login to your "yourdomain.com/wp-admin" Dashboard.

3. Then, Click on "Plugins" + "Add New" from left sidemenu of Dashboard.

4. Now, Click on "Upload Plugin" button.

5. Now, Browse "wp-gatekeeper.zip" Downloaded plugin from your computer, Where you downloaded wp-gatekeeper.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "WP-Gatekeeper" folder is added on left sidemenu. Now, Click on "WP-Gatekeeper" folder.

Noted that: If you do not see "WP-Gatekeeper" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about WP-Gatekeeper Configurtions and Settings or How to work "WP-Gatekeeper" in your WordPress site.

After Activated Plugin According to Step-6 then,

Go to "Plugins" + "Installed Plugin" from Wordpress Admin Panel Leftside Menu.
or Direct go to: https://yourdomain/wp-admin/plugins.php
Then, Find "WP-Gatekeeper" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is WP-Gatekeeper
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide

Guide
Upload to your plugins folder, usually `wp-content/plugins/`. Activate the plugin on the plugin screen. All right, I installed it. Now what? Load up the “Gatekeeper” management page under “Manage” and edit the default challenge, add some of your own, or both. The system will randomly pick a challenge from the list shown on the management page. If there’s only one challenge, then it will always be used. If you manage to delete all of the challenges, then comment posting will be impossible. If that happens, you can use the “reset to default” link in the “Challenges” area of the management page to quickly re-enable comments. You can also set a new master key, or generate a new random one, if you so desire. There’s no particular reason to do this, but what the heck, the option is there. My favorite manually-set master key is “spammerssuck” but you may feel otherwise.

Upload to your plugins folder, usually wp-content/plugins/.
Activate the plugin on the plugin screen.

All right, I installed it. Now what?

Load up the “Gatekeeper” management page under “Manage” and edit the default challenge, add some of your own, or both. The system will randomly pick a challenge from the list shown on the management page. If there’s only one challenge, then it will always be used. If you manage to delete all of the challenges, then comment posting will be impossible. If that happens, you can use the “reset to default” link in the “Challenges” area of the management page to quickly re-enable comments.

You can also set a new master key, or generate a new random one, if you so desire. There’s no particular reason to do this, but what the heck, the option is there. My favorite manually-set master key is “spammerssuck” but you may feel otherwise.

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Reffered: https://wordpress.org/