The InLinkz Linkup tool subscription is a monthly recurring subscription. It recurs every month until canceled. 

Once canceled, you will still be able to enjoy the full subscription until the end of your current billing cycle. 

You can cancel your subscription at anytime. Just go to to your "Account" page found at the top right of the website and click on  the red "cancel" link

just beside the "active subscription" wording

Alternatively, you can cancel your payments from the PayPal website, under "recurring payments"