From Posstack.com Documentations
After you create a Product/Page/Blog Post template by following the steps in the section Create Templates, you will be automatically redirected to the Theme Editor where you can start editing the page.
Another way to access the Theme Editor:
- From your Shopify admin, click Apps > Easy Content Builder
- From the Easy Content Builder dashboard, click Manage Templates.
- Then select the template that you want to edit and click Customize.