Horje
This plugins detects all of the styles queued via wp_enqueue_style. Contents of each css file are copied and stored in a single css file.

Noted That:

  • To install correctly this wp-css-merge.zip.
  • Fisrt Download the wp-css-merge.zip to your computer
  • Extract/Open wp-css-merge.zip to Your Computer.
  • Then, Find readme.txt file inside wp-css-merge.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 "wp-css-merge.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 "wp-css-merge.zip" Downloaded plugin from your computer, Where you downloaded wp-css-merge.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. "WP CSS Merge" folder is added on left sidemenu. Now, Click on "WP CSS Merge" folder.

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

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


Guide

Installing WP CSS Merge is easy, go to you your WordPress admin panel and click on Plugins > Add New, searching for “WP CSS Merge”.
Alternatively, you can install the plugin manually by downloading the plugin from wordpress.org/plugins
1. Upload the entire wp-css-merge folder to the /wp-content/plugins/ directory
2. Activate the plugin through the ‘Plugins’ menu in WordPress.
3. Customize the plugin from the menu by selecting AdUnblocker in the sidebar.

Reffered: https://wordpress.org/