WebPlus X5: Mal's Shopping Card HTML Template

Hello,

I'm currently trying to update my Mal's Shopping cart - I want to include a simple HTML email template rather than the Mal's one.

Mal's does supply a template which is perfect as I only want a very simple one but I'm not sure how I go about editing it!!

https://www.mals-e.com/support.php - link to template

can I use serif? Or another program?

Thanks,

Chelsea :)