Thank you very much Emma. I would be glad if you can help me to perform same thing to the standard Moodle blog. I wish to make some user as a blog admin such that only that user would be able to add the posts to the blog, and other would be only be able to view the blog posts. I tried by changing the permissions of the "authenticated user" role, when I change "create new blog posts" to prohibited, all users are prohibited, when I allow, all users are allowed. I want Only a particular user should be allowed to add posts to the blog, and the rest users should be only be able to view the blog posts.