Create Shopping Cart Summary Page

In the top navigation bar, Go to Pages and then press "Create a Page"  (You can select the branding page template for your new page while creating it but, you can also change it anytime afterwards if needed). 

Once, the page is created, you can drag the shopping cart summary widget from the right hand side widgets list under ECommerce


Once, the widget has been added to the page, you can press "Edit" to configure the link to shopping cart page and to checkout page.