A student may write a post that is only accessible to instructors only if the student is given the role contributor or author and the instructor has the role of editor or admin for the blog.
If a student has the role of editor or admin, all private posts will be visible to that student.
Private Posts
To create a private post you must be signed into the blog. Next, click on New Post. Complete the post and when you are ready to publish, click on edit under Publish ---> Visibility.
Change the visibility from public (default) to private. Click OK and publish. This post will include Private in the title and only be visible to editor and admin users of the blog.
Password Protected Posts
To create a private post you must be signed into the blog. Next, click on New Post. Complete the post and when you are ready to publish, click on edit under Publish ---> Visibility
Change the visibility from public (default) to password protected. Type the password into the field provided. Click OK to publish. This post will include Protected in the title and a password field will be visible to all users. Users that submit the correct password may see the post. Users with Editor or Admin roles may see the post in the dashboard view without the password.
Please see the Wordpress help section for more information .