We're sorry to see you go :(
Uninstalling the app will cancel your subscription. Simply sign into your Shopify account, look to the left hand side and you'll see Apps, click on that, you should see Shogun, then click the trashcan for un-install.
We would love to get your feedback. Were we missing a feature? Was it hard to use?
Here is a link for 10% in case you ever decide to give us another try:
Let me know if there is anything else I can do to help.