You cannot delete metrics contained in the Juris Metric Library. You can only delete newly created Metrics or copied Metrics.
To delete a metric, right click on the Metric to be deleted and select Delete. You can also select the Metric and click the Delete button in the Metric tool ribbon.
To delete a Metric library, right click on the library and select Delete Library. You can also select Library and click the Delete button in the Metric Libraries tool ribbon.