From Joomla! Documentation
This section lets you set up the default ACL permissions for all articles in all categories. These permissions may be overridden for specific categories and for specific articles.
To change the permissions, do the following.
- Select the Group by clicking its title.
- Find the desired Action. Possible Actions are:
- Configure. Users can access this screen (Article Manager→Options).
- Access Administrative Interface. Users can access the Article Manager.
- Create. Users can create new articles.
- Delete. Users can delete articles.
- Edit. Users can edit the contents of articles.
- Edit State. User can change the published state and related information for articles.
- Edit Own. User can edit the content or published state for articles that this user created.
- Select the desired permission for the action you wish to change. Possible settings are:
- Inherited. Inherited for users in this Group from Global Configuration.
- Allowed. Allowed for users in this Group. Note that, if this action is Denied at one of the higher levels, the Allowed permission here will not take effect. A Denied setting cannot be overridden.
- Denied. Denied for users in this Group.
- Click Save. When the screen refreshes, the Calculated Setting column will show the effective permission for this Group and Action.