If you decide OrderlyPrint is not for you, you can uninstall at anytime by doing the following:
In your Shopify Admin, go to the Settings section
Find the "Apps and sales channels" section.
Locate OrderlyPrint in your list of installed apps
Click the Uninstall link all the way on the right side, and confirm.
This will automatically remove the app from your store, and cancel any active trial or subscription.