video Wordpress User Roles: Rights of Author, Contributor and Subscriber
Tutorial here:
http://fourblogger.com/how-to-change-user-roles-for-multiple-user-in-wp-admin/ You can allow other as author or contributor or subscriber in your wordpress blog. Each user role has different rights to access wordpress admin dashboard. This tutorial explains what are the things authors, contributor and subscribers can do. See the instructions before give access to other 3rd party persons.