2. Edit the email content, for example, click "Template" next to it and select a template to edit; Then click "+Subscribe" on the right side of the email content.
3. In the pop-up page, select "Insert the location of subscription content" and click OK.
4. After inserting the subscription content, you can see the added subscription content below (or above) the letter content.
Insert the subscription, add the customer address and subject, and then send an email.