Hi bobbiejo45,
If you are using Auctiva to create your listings, any images that you place in the "Select an Image" boxes on the Auctiva lister page will automatically reflect the "Click to Supersize" option provided that the original versions of the images are larger than 400 x 300 px.
On the other hand, if the original versions of the images you are using are not larger than 400 x 300 px, or if you place your images directly into the description editor using the "Insert an Auctiva Hosted Image" button, they will not have the "Click to Supersize" option.
If you have any additional questions or concerns regarding your Auctiva account, please contact our customer support team using the web form on the following page:
http://www.auctiva.com/help/requesthelp.aspx-Mike