Once you create your business, you will be brought to a setup shop page. You can also find setup shop link in Customize Shop page. This page will show you all information that you need to set, in order to start accepting orders, such as categories, items, and time slots.
In order to add items, first, you need to add categories. Fill up the categories fields, and click Update Shop to make sure the categories appear in items table.
Click Preview to see how your shop will looks like. Click Done to finish editing and go back.