To change the permissions a writer has, you will have to change the role that is set. This can be changed through their Publication/Column settings.
In the navigational menu, click Publications
Search for the desired Publication
Click on the Publication Name
Click Members
Select the appropriate role for the writer based on the following features:
Contributor
Use for a contributor whose posts must be reviewed before publication.
A Contributor can write posts but cannot publish them. Content must be published by a staff member.
Author
This is the default role for all contributors.
An Author can publish and manage only their own stories.
An Author within a group blog cannot publish nor update other author's stories.
Editor
An Editor can publish and manage their own stories.
An Editor can change the primary author as well as add a co-author
An Editor within a group blog can publish and manage other writers' stories.
Admin
An Admin can publish and unpublish their own stories.
An Editor within a group blog can publish, unpublish and manage other writers' stories.
An Administrator can manage their Publication settings.
Note: Please obtain approval before setting this role.