If you want select one 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..
This section describes how to install the plugin and get it working. example.
Upload plugin-name php to the wp-content plugins directory.
Activate the plugin through 'Plugins WordPress...
Upload plugin-name php to the wp-content plugins directory 2.
Activate the plugin through 'Plugins WordPress..
Just install this plguin and check your category taxonomy type in your post option or see this screenshot http prntscr com 7yd7rs...
Installed because I wanted to stop users from selecting more than one category.
The following people have contributed to this plugin..
Browse the code, check out SVN repository, or subscribe to the development log by RSS...
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