You can create a new template in the "Templates" section of Track. From here you can view/edit existing templates and create new templates.
You can edit your template in the same ways as a normal email and add a follow-up email to your template by clicking the box under the editor. Click "new" when you are done and it's ready to go.
You are able to edit your template by clicking on the template name or delete any of your templates by hovering over it on the "Templates" page.