This information is from WordPress.com’s website. At this time the blog moderator is the Administrator, members of the Arts Section’s Executive Committee, all Committee Chairs and Discussion Group conveners are Editors, and all other official participants are Contributors. Those who have not requested participation can post comments, which are subject to approval by the moderator.
There are four roles: Administrator, Editor, Author, and Contributor.
Here is what they can do:
The Admin can do everything. Complete power over posts, comments, settings, theme choice, import, users – the whole shebang. Nothing is off-limits, including deleting the entire blog.
They can publish any posts, edit any posts, edit any published posts, edit any pages, moderate comments, manage categories, manage links and upload files. They can also delete any posts and any pages. They can read, edit and delete private posts.
Is able to edit their posts, publish their posts and upload files. And they can delete their posts too.
They can edit their posts but cannot publish.