Hi - Making changes in an active listing is pretty easy. If you want to change pictures within your template, or change the template itself, you can copy and paste the HTML from your revised listing in Auctiva to your active listing in eBay as follows:
1) Locate your listing in your Saved Listings folder in Auctiva, open it, make any necessary changes, preview, and save.
2) Check the box next to your revised listing in your Saved Listings folder and click the “Get HTML” button.
3) Select all of the HTML in the popup box and copy it.
4) Locate the item on eBay and click the "Revise your item" link.
5) Click "Edit Description" then click the "HTML" tab.
6) Select all of the HTML that's there, paste the copied HTML in its place, and save your changes.
Keep in mind that the copy & paste of HTML described above only applies to the template area. If you wish to revise items outside the template (title, category, price, etc.), you need to do that directly from the ebay "revise your listing" page. However, changes just to text within the template (description or seller details) can easily be done on that page as well, without the need to replace HTML.
Hope this helps.