Membership is for the period that you select, and it doesn't auto renew, putting you in complete control of your membership payments.
The minimum period of membership is 3 month, and membership subsciptions are non refundable.
If you wish to cancel your membership you can do so simply by logging a support ticket, and your membership will simply expire at the end of your period.
For more information about the Membership subscription please see relevant blogs:
FAQs on Membership
Is the Membership fee costing me money