1. Navigate to Settings > Templates and create your new template by clicking the “New Template” button. Give the new template a name and then click the “Create Template” button.
You can now edit the new template to change how it looks. If you would like to make the new template the default for new campaigns and new broadcasts then click the “Set as Default” button at the bottom of the page.
2. To set your new template to be used for an existing campaign go to the “Emails” tab for your campaign and open one of the emails. Next click on the “Preview” tab. Then at the very bottom of the email editor click the link that says “Change for all emails in this campaign”.
Choose your template and then click the “Update Template” button.