Cases exist within a project.
To enable cases to be created, you must turn on cases for the project(s) you want cases to be created within.
Steps
Access the Project Preferences page of each project you want to enable cases on
You arrive on the Project Preferences page
Tick the Enable Cases checkbox
Once you tick this box, the Select who can create cases box appears
Use this box to enter the names of Project Reporters of the project whom you want to permit to create cases. (By default, Project Managers automatically have permission to create cases)
Scroll to the bottom of the page and press Save
You arrive on the Project page