This SEO plugin checks the content of posts/pages for the keyword density (single/phrases) while writing and is automatically setting the META-tags.

Noted That:

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

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Keyword Statistics" folder is added on left sidemenu. Now, Click on "Keyword Statistics" folder.

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

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

Guide

Guide
Just copy the `keyword-statistics` folder to the plugins directory of your blog. Enable the plugin in your admin panel. Use the options panel to choose the settings you want. Updating: If you are updating by uploading the files by your ftp program you should login as admin after it. This way options added in later versions will be initialized without changing the way your blog has served meta informations before. After updating you should check the plugins configuration at the options panel and save the settings. If anything goes wrong with the plugin do this first. There may are new options for whom an initialization is needed and this will be done by saving the configuration. Just tell your authors which keyword density you need and let them create the content – the on-page SEO work will be done automatically. Remember that all META informations (meta keywords, meta description and the meta-tags for robots – and moreover the canonical url in WordPress versions less than 2.9) will only be generated and served by your blog if you have created or edited your posts or pages after installation of the plugin. Each older post or page has to be opened and saved manually if the keywords, description and robots META should be generated (if you configured automatic setting of meta data) automatically. After that the header tags for search engines will be set and served from the next page-request on. By the way you can check the keyword density of the page content – maybe you have to change the text a little bit to reach your desired density.

Just copy the keyword-statistics folder to the plugins directory of your blog.
Enable the plugin in your admin panel.
Use the options panel to choose the settings you want.

Updating: If you are updating by uploading the files by your ftp program you should login as admin after it.
This way options added in later versions will be initialized without changing the way your blog has served meta informations before.

After updating you should check the plugins configuration at the options panel and save the settings.
If anything goes wrong with the plugin do this first.
There may are new options for whom an initialization is needed and this will be done by saving the configuration.

Just tell your authors which keyword density you need and let them create the content – the on-page SEO work will be done automatically.
Remember that all META informations (meta keywords, meta description and the meta-tags for robots – and moreover the canonical url in WordPress versions less than 2.9) will only be generated and served by your blog if you have created or edited your posts or pages after installation of the plugin.
Each older post or page has to be opened and saved manually if the keywords, description and robots META should be generated (if you configured automatic setting of meta data) automatically.
After that the header tags for search engines will be set and served from the next page-request on.
By the way you can check the keyword density of the page content – maybe you have to change the text a little bit to reach your desired density.

automatically, writing, setting, meta, tags, while, singlephrases, content, checks, postspages,

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Reffered: https://wordpress.org/