When installing the easyPoints app, you are given the option to continue with a Quick Install or Custom Setup.
Quick Install is a fast and easy way to start using easyPoints if you require little to no customization. You can quickly install the easyPoints widget and add app blocks (app blocks can only be used with Online Store 2.0 themes) and start offering points to your customers in minutes. Some of your theme sections might not support app blocks. Therefore, it's advised to select the Custom Setup if you require detailed customization (e.g. - requiring points to be displayed in a specific spot on a page not doable through app blocks or having the widget appear only on certain pages).
Custom Setup involves editing theme code, allowing more options to customize how shoppers will engage with your points program based on your web site's look and feel.
Please note, Custom Setup requires some time to set-up before you can use on your theme; but, it will be integrated into your shop design and provide better user experience.