Horje
Limits a post to a single category by changing the checkboxes into radio buttons. Simple.

Noted That:

  • To install correctly this only-one-category.zip.
  • Fisrt Download the only-one-category.zip to your computer
  • Extract/Open only-one-category.zip to Your Computer.
  • Then, Find readme.txt file inside only-one-category.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 "only-one-category.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 "only-one-category.zip" Downloaded plugin from your computer, Where you downloaded only-one-category.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. "Only One Category" folder is added on left sidemenu. Now, Click on "Only One Category" folder.

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

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


Guide

Activate the plugin. Now you should only see radio buttons where you previously saw category checkboxes. That’s why you downloaded it, right?

Reffered: https://wordpress.org/