Hi Katy,
Not at all. As long as your listings have not received bids and have greater that 12 hours of duration left, you can change the images and/or the description. In order to make these changes, you will just need to revise each listing via the following process:
1) Locate your listing in your Saved Listings folder, make any necessary changes, and save.
2) Click the "<HTML> icon to the right of the item on your "Saved Listings" page
3) Select All and copy the html in the popup window.
4) Locate the item on eBay and click the "Revise Item" button.
5) Scroll down to the "Description" section and then click the "HTML" tab above the description editor.
6) Delete the existing description HTML, paste the copied HTML in its place, and save your changes.
In step 1, you will just want to make ANY changes to the listing that you would like to transfer to the associated active listing, including both the images and the description if you'd like.
If you ONLY want to change the description text of a listing, the easiest way to do so would be to go straight to eBay's "Revise your Item" form. Once on the "Revise your Item" form of the desired listing, you can just scroll down to the "Description" section and click the "Standard" tab along the top of the editor. You will then see your description within the editor exactly how it appears in the listing and can make your changes using your cursor, keyboard, and the editor toolbar.
Any additional questions or concerns? Please file a support request using the appropriate link on our help page: http://www.auctiva.com/free-auction-software-help/help.aspx
-Mike