How do I make a payment auto renew?

I'm using an authorize.net payment widget on a subscription form I created and I'd like it to auto bill every year. How is that accomplished? 

Rather than setting up products as the payment type, set up subscriptions:

https://www.jotform.com/help/166-How-to-Setup-a-Recurring-Payment-Option

Set the subscription period to "Yearly" to bill them once per year.