Please go to your Paypal Auto payments page: https://www.paypal.com/myaccount/autopay/
If that link doesn't work:
Log into Paypal.
Secondly, click on the options cog.
Go into Payments and 'Automatic Payments'.
On the left you will see your Active Payments. Click the "See More" button at the bottom of the side to view all your auto payments.
There you can click on Streamline Servers and cancel the subscription.