Hi Helen,
For new listings, you can select a template as normal.
For existing Active listings, you would need to replace the HTML code at eBay using their Revise Listing editor and copy - paste the code from your Saved Listings library. That means you'd need to create or update a Saved Listing at Auctiva with the desired template.
Copy is done using the <HTML> icon to right of each listing on the Saved Listings page. You'll get a pop-up box with the code.
Paste is done with the eBay Revise Listing editor set to HTML mode for the Description section, i.e. because you are creating HTML on that editor. You delete the prior code and replace it with the new code. However, when deleting, you need to keep the code for the Scrolling Gallery section. That code begins and ends with a comment <!--ASW--> to demark the section. Use preview to double-check your changes before you commit on the Revise.
Hope that helps.
Danno