How do I cancel my Pro Subscription?

When you cancel your Pro subscription before the end of it's term, your membership will continue until the end of the period you paid for and will not renew.  

For iOS: 

You can cancel your subscription on your iOS device. Go to Settings>Apple ID>Subscriptions. Select the Shot Lister subscription - tap it to bring up the cancel option. Just be sure to log into the App store with the same Apple ID you used to purchase the subscription.

2) In Shot Lister, on your device, open the settings menu, touch the "Shot Lister Pro" button, and you will be given the option to cancel.

For MacOS:

You can also log into the Mac store from the dock of your computer using the same Apple ID you used to purchase the subscription. Scroll down to your Name at the bottom of the left hand side bar, click on it to open your account. This will bring up your Purchases, select View Information on the top right then scroll down to Manage where it will list all your Subscriptions. Click on Subscriptions and then select the one you want to cancel.