This plugin will automatically set and/or update the Authenication Unique Keys in the wp-config.php file.

Noted That:

To install correctly this update-unique-keys.zip.
Fisrt Download the update-unique-keys.zip to your computer
Extract/Open update-unique-keys.zip to Your Computer.
Then, Find readme.txt file inside update-unique-keys.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 "update-unique-keys.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 "update-unique-keys.zip" Downloaded plugin from your computer, Where you downloaded update-unique-keys.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Update Unique Keys" folder is added on left sidemenu. Now, Click on "Update Unique Keys" folder.

Noted that: If you do not see "Update Unique Keys" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about Update Unique Keys Configurtions and Settings or How to work "Update Unique Keys" 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 "Update Unique Keys" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is Update Unique Keys
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide
Note: As is the case when installing any new plugin, it’s always a good idea to backup your blog data before installing. After downloading the Update Unique Keys plugin, unpack and upload the file to the wp-content/plugins folder on your blog. Make sure to leave the directory structure of the archive intact so that all of the Update Unique Keys files are located in ‘wp-content/plugins/updateuniquekeys/’ You will need to activate the Update Unique Keys plugin in order to update your wp-config.php file. Go to the Plugins tab and find Update Unique Keys in the list and click Activate. After activating proceed to the plugin settings page (under Settings > Update Unique Keys) to update your keys and wp-config.php file. You will be automatically logged out, due to the keys changing, simply re-login with the same username and password.

Guide

Note: As is the case when installing any new plugin, it’s always a good idea to backup your blog data before installing.

After downloading the Update Unique Keys plugin, unpack and upload the file to the wp-content/plugins folder on your blog. Make sure to leave the directory structure of the archive intact so that all of the Update Unique Keys files are located in ‘wp-content/plugins/updateuniquekeys/’
You will need to activate the Update Unique Keys plugin in order to update your wp-config.php file. Go to the Plugins tab and find Update Unique Keys in the list and click Activate.
After activating proceed to the plugin settings page (under Settings > Update Unique Keys) to update your keys and wp-config.php file.
You will be automatically logged out, due to the keys changing, simply re-login with the same username and password.

keys, configphp, file, unique, authenication, automatically, andor, update, plugin,

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Reffered: https://wordpress.org/