There is a Page section called 'Offerings' that allows you to add services or products to your website. If that page section is not already added to your site just go to the 'Sections' tab at the top of your editor.
Click on the 'Add Section' button at the bottom of the modal box
You'll see a list of available page sections
Click on it to add it to your site
* If you don't see it there, that's because it's already been added. You'll be able to see it listed right when you open the 'Sections' tab.
You can add payment links to your products here too.