I have tried the "Check out wizard" to see the database options, but it always says: "Please insert an eCart Display at least once in this site before using the wizard." What means by "insert an eCart Display at least once"?
I added a "Add to cart" button to my page, and clicked the ""WebAssist->eCart->Display Manager" , it just add a piece of gray code to the page, then tried "Checkout Wizard", it still shows "Please insert an eCart Display at least once in this site before using the wizard."