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

How fast are your VPN servers?
LiquidVPN only runs dedicated baremetal servers with 1 Gbps or 10 Gbps ports. We only use premium...
Do you offer a guarantee?
Yes, we offer a money back guarantee. If for any reason you are not happy with LiquidVPN cancel...
What methods of payment does LiquidVPN accept?
We accept the following currenciesPaypal, Credit Cards, Cash, Bitcoin, Litecoin, Peercoin,...
Where is LiquidVPN located and what are your countries logging policies?
LiquidVPN is located in the United States. The United States does not have any logging policies....
Are there any hardware requirements to use LiquidVPN?
A VPN client will run on virtually any semi modern device. It should be noted that the CPU power...