valeriedore on "Want to give access to edit a particular post to particular role"

Hi,

How to prevent a user to edit a particular post? I need to use functions.php and not a plugin. Plugin is not working in my case :

If I activated : edit_others_posts, to give access to edit post in the "WYSIWYG Widgets" (https://wordpress.org/plugins/wysiwyg-widgets/), the Author role can change all the "posts" there.

Thanks,
Valerie