To delete an email/SMS template, go to Home>Organization and click on the Email & SMS Templates tab. Select the template to delete. Once its fields are displayed, click the Delete button in the top right of the page.
A confirmation dialog will be displayed. Click OK to confirm the deletion.
A second confirmation dialog will be displayed. To continue with the deletion, type "YES" and click OK.
Following this confirmation, the template will be deleted. You may need to refresh the page to observe that the template has been deleted.