Hootsuite PAID Apps
To cancel a PAID app subscription, click the App Directory icon in the menu on the left-side of your Hootsuite dashboard:
Next, click Installed to get a list of the apps you have installed:
Scroll through the list of installed apps, until you've found the app you want to cancel the subscription for. Hover over the Installed button for the app:
and it will change to Uninstall. Finally, click Uninstall, and the app will be removed from your dashboard, and the subscription canceled.
If you are using Synap Apps, follow the instructions under canceling your subscription: https://synaptive-support.zendesk.com/hc/en-us/articles/360004626691-Synap-Apps-Quick-start-guide