For all subscriptions:
Open a ticket (http://support.swissmademarketing.com) or send an email to firstname.lastname@example.org with your product, which you want to cancel, and the date of the last payment.
For all PayPal subscriptions:
Since your subscription is tied to your personal PayPal account you will need to log-in to your PayPal Account and cancel the recurring payment to email@example.com.
This will cancel your subscription and prevent it from renewing automatically.
Please refer to this link for more information on cancelling a recurring payment through PayPal: https://www.paypal.com/webapps/helpcenter/article/?articleID=94044&m=SRE#canceling_recurring_paymemt_subscription_automatic_billing.