After the installation, you need to buy the monthly plan available for the app. Once the payment is done for the plan, you will be redirected to product label page.From here you can add labels according to your requirement.Now to assign a label to the product,go to your shop's admin and visit product listing page,edit any product to which you want to assign the label and click on "Manage Product Label" option which will redirect you to the assign product label page and from here you can assign any of your added label to the product for any page.This app allows you to display label on product for Home Page,Product Description Page and Collection Page.