Hi,
Normally, when you signup and generate the token, Auctiva will automatically pull your active listings and add the Scrolling Gallery.
It's talked about in the General section of the FAQs.
http://www.auctiva.com/free-auction-software-help/help.aspx#on-signup
http://www.auctiva.com/free-auction-software-help/help.aspx#listings-disappear
If it doesn't happen soon, I'd enter a Support Case and enquire. Use the HELP link at the top of the page and look lower right for the link.
Danno