Autoptimize criticalcss.com power-up adds automated critical css creation to Autoptimize integrating with the https://criticalcss.com service.

Noted That:

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

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Autoptimize criticalcss.com power-up" folder is added on left sidemenu. Now, Click on "Autoptimize criticalcss.com power-up" folder.

Noted that: If you do not see "Autoptimize criticalcss.com power-up" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

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

Guide
Install from your WordPress “Plugins > Add New” screen (search for Autoptimize) Activate the plugin. You will see a “Critical CSS”-tab in Autoptimize. Enter the API key from your https://criticalcss.com (optional): create a default rule which can be used if no automated rule applies. (optional): create manual Path-based rules for specific pages to override automated rules. If you leave the critical CSS field of path-based rules empty, the plugin will automatically generate it. To get critical CSS going, make sure there are requests coming in that are not served by a page cache

Guide

Install from your WordPress “Plugins > Add New” screen (search for Autoptimize)
Activate the plugin.
You will see a “Critical CSS”-tab in Autoptimize.
Enter the API key from your https://criticalcss.com
(optional): create a default rule which can be used if no automated rule applies.
(optional): create manual Path-based rules for specific pages to override automated rules. If you leave the critical CSS field of path-based rules empty, the plugin will automatically generate it.
To get critical CSS going, make sure there are requests coming in that are not served by a page cache

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Reffered: https://wordpress.org/