You can design a new template from scratch, or create a template from an existing email. Once you create a template, it will show up on your All Emails page and in your Template Gallary under My Email Templates.
RecommendedTo use a template to create a new email, see our Create an Email from a Template article.
Outbound > Emails or from the home dashboard button.

Create.
RecommendedOnce a template is created, you can still edit and revise a template's design and settings.
Content > Emails or from the home dashboard button.
My Email Templates.
+Create.
Create.