Hi @hwsiew,
Are you referring to the plugin’s built in subscription functionality or using WooCommerce Subscriptions? I will base my answer on the plugin’s built in functionality.
To cancel a subscription as an admin, you would go to the subscription edit page located within the WordPress Admin panel. From there, you would change the subscription’s status to canceled. This will trigger a call to Braintree where the corresponding Braintree subscription will be canceled.
As a customer, to cancel a subscription you would go to your My Account > Subscriptions > View Subscription page. From there the customer would click the “Cancel Subscription” link.
Thanks,