You can cancel subscriptions by logging in and going to the user icon in the top right hand corner of Keysearch. A menu should drop down, go to the Settings/Upgrade page and there should be an option to cancel your subscription. UNLESS YOU PAID THROUGH PAYPAL. THEN FOLLOW THE DIRECTIONS BELOW.
To Cancel your subscription just login to your Paypal account and go to the Pre-approved payments section. You can find that here:
If you ordered directly with Paypal you should see the subscription listed and cancel it. It may be listed under Venture Online. This will cancel your Keysearch subscription at the end of the billing cycle.