If you would like to send customers to a page prior to them seeing the sales page you can use the Pre-launch option. This could be to gather email addresses, have customers sign up to a training series prior to your launch, or even if you simply want a bridge page with the buy button on the the following page.
If you check the box seen in the screenshot below, your affiliate traffic will go directly to your sales page after launch date/time that you set. If left unchecked, all of your affiliate traffic will go to your presell/landing page/pre-launch page until you change the URL or remove it.
You can also use this option to set up a free product. To learn more about setting up free products on JVZoo you can read the article here.