Auto Set the first image of your post to Featured Image.

Noted That:

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

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Autoset Featured Image" folder is added on left sidemenu. Now, Click on "Autoset Featured Image" folder.

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

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

Guide

Guide
Updgrading From A Previous Version To upgrade from a previous version of this plugin, delete the entire folder and files from the previous version of the plugin and then follow the installation instructions below. Installing The Plugin Extract all files from the ZIP file, making sure to keep the file structure intact, and then upload it to `/wp-content/plugins/`. This should result in the following file structure: `- wp-content - plugins - autoset-featured-image \| autoset-featured-image.php \| LICENSE \| license.txt \| readme.txt` Then just visit your admin area and activate the plugin. See Also: “Installing Plugins” article on the WP Codex

Updgrading From A Previous Version

To upgrade from a previous version of this plugin, delete the entire folder and files from the previous version of the plugin and then follow the installation instructions below.

Installing The Plugin

Extract all files from the ZIP file, making sure to keep the file structure intact, and then upload it to /wp-content/plugins/.

This should result in the following file structure:

- wp-content - plugins - autoset-featured-image | autoset-featured-image.php | LICENSE | license.txt | readme.txt

Then just visit your admin area and activate the plugin.

image, featured, post, your, auto, first,

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Reffered: https://wordpress.org/