To delete a role, navigate to the Roles UI/tab, select the custom role that we created, and click on Delete. You cannot delete built-in roles:

To edit a role, navigate to the Roles UI/tab and click on the custom role that needs to be edited. The user is taken to the Roles Details page. Make the required changes in the Privileges section and click on the Update role button.

You can also delete the role from this page: