In order to manage the auto-renewal of your subscription, follow the steps below:
Log in to your Parallels account, go to Subscriptions and Licenses > Personal Subscriptions, and click on the subscription you would like to manage to get to the Subscription Details page.
Click on the Disable auto-renewal action link to disable the automatic renewal of the subscription.
When the auto-renewal is canceled, the action link changes to Enable auto-renewal.
Click on the Enable auto-renewal action link to enable the automatic renewal of the subscription.