Making changes to your add-ons is as simple as can be—whether you're looking to dial down the quantity or cancel it altogether.
Head over to the App Store and click on the add-on you're looking to adjust. On the add-on's page, either reduce the quantity by updating the numbers and clicking Update, or remove the add-on by hitting Remove.
Any changes you make will stay in effect until the end of your current billing cycle, keeping your site smoothly running without a hitch.