In your dashboard, go to LANDING PAGES > MANAGE PAGES. At the top, click on +Add New Page (
). Once there, you'll notice we offer a few different page types. Choose the one called Shopping Cart Landing Page and click +Add Page (
). Once the pages is added, you'll noticed the mobile web page editor has an additional control for the Shopping Cart add-on. Click on the Shopping Cart Items button (
) to edit or add your items. After you're done editing your settings, you'll notice the changes will show up right away in your editor.