Let's you select a specific category for featured posts, and manage those selections on the WordPress dashboard.

Noted That:

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

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Featured Post Manager" folder is added on left sidemenu. Now, Click on "Featured Post Manager" folder.

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

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

Guide

Guide
Upload the `featured-post-manager` folder to the `/wp-content/plugins/` directory Activate the plugin through the ‘Plugins’ menu in WordPress Go to the WordPress Dashboard and you will see the Featured Post Manager Widget at the top The widget will ask you to select a category that you wish to manage. Do so, then click “Manage!” Now you’ll see a list of posts that have the category assigned to them. You can hover over them and click “Remove” to remove them from the list To add a new post to the list, select the post from the dropdown and click “Feature!”

Upload the featured-post-manager folder to the /wp-content/plugins/ directory
Activate the plugin through the ‘Plugins’ menu in WordPress
Go to the WordPress Dashboard and you will see the Featured Post Manager Widget at the top
The widget will ask you to select a category that you wish to manage. Do so, then click “Manage!”
Now you’ll see a list of posts that have the category assigned to them. You can hover over them and click “Remove” to remove them from the list
To add a new post to the list, select the post from the dropdown and click “Feature!”

those, selections, wordpress, dashboard, manage, posts, select, specific, category, featured,

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Reffered: https://wordpress.org/