1. To delete an operator, you have to be first on your admin account.
2. Press on the Operators tab (
) from the left side of the page.
3. Then press on the List tab ( ) from below in order to see all operators.

4. Then press on the Delete button (
) on the right of the wanted operator.

5. Once pressed, the operator will be deleted, so think twice before taking this kind of action.