To set up a trial period on a recurring subscription go to your Seller's Dashboard https://www.jvzoo.com/sellers. You can either add a new product or you can edit an existing one.
Next to 'Commission Payout Percentage' you will need to check the box that says 'Subscription or Multiple Payment' https://www.screencast.com/t/F5XwE2IIwI
That will then open the subscription settings box for you.
~Commission Payout Percentage is what the affiliate will be paid on recurring payments AFTER the trial payment and initial payment. https://www.screencast.com/t/1mQ2psg1w
~Payment Period is how often the customer will be billed for their subscription. This is done in months. For instance; monthly is billed every '1' month and yearly would be billed every '12' months. https://www.screencast.com/t/fDpn8n1X
~Number of payments is how many payments the customer will make. (the max is a span of 10 years) https://www.screencast.com/t/atZEJsTBn
~Commission Payout on 1st Payment is the commission percentage the affiliate will be paid on the first payment (after trial) https://www.screencast.com/t/mAPrOpeJhLOO
Tick the circle to YES in order to offer a trial and the to expand the subscriptions settings box: https://www.screencast.com/t/fsRlAAY6yTh
~Trial Price is the price the customer will pay for the trial period
~Trial Length is the amount of days the customer has of the trial until they are billed with their first payment.
~Commission Payout on Trial Payment is the commission percentage the affiliate will receive on the trial payment only
Once complete, it should look something like this: https://www.screencast.com/t/JVpjwjFxmnO and you can continue with your product setup.