Hello hippophile1 -
You are welcome to add HTML to your descriptions as you see fit on the lister page by changing the Description Editor to HTML mode, which you can do by clicking on the Source button on the editor. You can also customize templates or add a custom template to your account using options from the Custom Templates area from the listings menu.
If you would like to see changes or additions to our existing templates, please feel free to submit a request at our recently revitalize Feature Center, located here.
You should be able to post listings that use no template or custom HTML without difficutly, please note that if you opt to use no template when posting from Auctiva you will not be able to add a Seller Details profile to the listing.