If you wish to pause your subscription, you can switch auto-renew to OFF in your account settings.
When auto-renew is OFF, you'll receive an automated message when your current membership period is nearing expiry - this will let you know how to reactivate your account manually for a further month, should you wish to do so.
If your account has auto-renew set to ON, payment will be made automatically and you will receive an email letting you know that your subscription has been extended for a further month.