1. Click Account Details.
2. Scroll down to Children Details > Click Manage Subscription next to the subscription that you wish to cancel.
3. Click Cancel Subscription.
   
   
4. Click Yes, proceed to cancellation. 
   Note: You can still use your subscription till the expiry date.
   
   

Cancel my subscription - Apple

If you subscribed to Matific via Apple, you must cancel your subscription via Apple.

1. Click Account Details.
2. Scroll down to Children Details > Click Cancel Subscription next to the subscription that you wish to cancel.

This will redirect you to Apple, from where you can cancel your subscription.