If you want select one category in your wordpress when user post, then required change category/taxonomy type in your post option. so if you don't know how to it. then use this plugin. if you use this plugin then automatic change category/taxonomy type checkbox to Radio button.

Full Documentations

You can watch this video https://www.youtube.com/watch?v=f_U58WtoT6c

How to install this plugin?

Just follow this information 1. Upload plugin-name.php to the /wp-content/plugins/ directory 2. Activate the plugin through the 'Plugins' menu in WordPress

How to use this plugin?

Just install this plguin. and check your category/taxonomy type in your post option. or see this screenshot http://prntscr.com/7yd7rs

1.1

• WordPress 4.3 version support.

1.0

• Just Create new version.

This section describes how to install the plugin and get it working.

example:

1. Upload plugin-name.php to the /wp-content/plugins/ directory
2. Activate the plugin through the 'Plugins' menu in WordPress

Output