To remove a user-specific permission, click the Configure icon 
in the upper-right hand corner and navigate to Users on the left-hand panel.
Select a Greenhouse user profile from the subsequent list.
On the Edit User Profile page, navigate to the User-Specific Permissions panel. Uncheck the permissions to be removed from the user.
Note: The user-specific permissions listed are dependent on the permission level (Basic, Job Admin, Site Admin) assigned to the user.
Click Save when finished.