Horje
This is a WordPress plugin that turns your 404 "page not found" error into a page devoted to helping find missing children.

Noted That:

  • To install correctly this notfoundorg-404-page.zip.
  • Fisrt Download the notfoundorg-404-page.zip to your computer
  • Extract/Open notfoundorg-404-page.zip to Your Computer.
  • Then, Find readme.txt file inside notfoundorg-404-page.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 Tips Below.

Start the Tips:

1. First Download "notfoundorg-404-page.zip" Plugin to your Local Computer. (Click Download)

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

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

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

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5. Now, Browse "notfoundorg-404-page.zip" Downloaded plugin from your computer, Where you downloaded notfoundorg-404-page.zip According to Step – 1 Above then, click on "Install Now"

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6. Now, Click on "Active Plugin"

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7. Then, See left sidemenu. "NotFound.org 404 Page" folder is added on left sidemenu. Now, Click on "NotFound.org 404 Page" folder.

   Noted that: If you do not see "NotFound.org 404 Page" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about NotFound.org 404 Page Configurtions and Settings or How to work "NotFound.org 404 Page" in your WordPress site.

 

oR

After Activated Plugin According to Step-6 then,

  1. Go to "Plugins" + "Installed Plugin" from Wordpress Admin Panel Leftside Menu.
  2. or Direct go to: https://yourdomain/wp-admin/plugins.php
  3. Then, Find "NotFound.org 404 Page" Activated Plugin from Plugin List.
  4. Then, Click on "Settings" from Plugin that is NotFound.org 404 Page
  5. Now, Edit/Add/Config the setting and Click on "Save Changes" button,
WP Plugin Setting


Guide

There aren’t really any special instructions for installing this plug-in. Once
installed, be sure to go to the ‘NotFound.org’ settings page if you’d
like to do some basic customization.

Reffered: https://wordpress.org/