To set the background for the whole email, click on the "Email background" icon.
A form will appear.
Set the template background color.
Click on the "Select the file" to upload an image.
A file browser will appear. Select the desired picture.
Click on the "Open" button.
The picture will appear in the form.
To delete the picture, click on the "Delete" icon.
Select whether the picture should be repeated or not.
Select the background image position.
Select the image size — original, display all or fill the space.