• Sign in to the JBJS Store
• Click 'Go To Your Product' 
• Select 'Renewal Settings'

• On the next page, make sure the box 'Enable automatic renewal of this subscription' is checked. Then click Enter Card.

A pop-up will appear asking you to enter your card information. Once you have done that, click Save.

You will then receive an email confirming you have enrolled in auto-renew.

Note: This option is only available after the purchase has been made