If you are using the Free Plan (Spark Plan), you can simply cancel your subscription. On the top right of the page, click on Account. Click on your Contract, and then on the Cancel Subscription button.
If you are using the Monthly/Annual Plan, you need to first unmap all your properties from channels within Zeevou. In Listings -> Properties, open the property page and click on Channel Manager Config. After unmapping the property from all channels, click on the Disconnect From Channels button. Please raise a hand or send an email or inform email@example.com to make other arrangements. Then you can open your contract and click on the Cancel Subscription button.