To create a new template, use the green “+ Template” button on the “Templates” screen.
Give the template a name and select an existing template to base your new template off of (you can choose “Blank” to start completely fresh!), then click “Next” to edit the template.
Refer to Create a Messages template for complete instructions on setting up a template.
Save the template with the “Save” button in the bottom-right corner of the template editor. Remember to save frequently, as there is no auto-save feature.