Follow these simple steps if you do not want to renew your plan automatically.
Go to Your account at the top right corner of your screen
Click on Account and profile management
Click on Subscription from the menu on the top, then click on Cancel renewal.
Confirm your choice by pressing Cancel Renewal in the box on the right, or press I want to stick to my plan in case you changed your mind.
Your current plan will end at the date of expected termination