To create a new template, or update an existing one, make sure to save your changes in the Email Designer by clicking "Save" in the top right corner.
To save as a new template, type the name of the template into the "Save as New Template" box and click "Save Template".
To update an existing template, choose the template name from the "Upate Existing Template" drop down. Click "Update Template".
To save your changes in your email file, click "Save" in the top right corner.