To cancel your subscription click the VPN Administration button on the left hand menu of https://my.liquidvpn.com/clientarea.php 
Click VPN Administration 
Click the service you want to cancel
Click Request Cancellation
Choose to cancel immediately (takes up to 24 hours to process) or at the end of billing period
Either option will stop your subscription before being billed again.

Also Read

Can I use LiquidVPN instead of my ISP?
No, a VPN works in conjunction with your internet connection. It cannot be used to replace your...
Am I completely anonymous with LiquidVPN?
LiquidVPN is a privacy service. It is important to note that by design a VPN does not provide an...
Do you offer TCP and UDP OpenVPN connections?
Yes, and we provide several ports for each type of network topology we offer.
Can I change my invoice payment method?
Yes you can. You will need to do it from your account details screen...
Do you block any ports or types of traffic?
No we do not block any ports out right. Port 25, 22, 21, 23 are monitored for abuse, if our...