To edit the restaurant page:
In the Website Editor, click Pages.
Find the Restaurant Menu page, or add it as a new page, and click the Edit button.
Inside the Products tab, click the arrows icon and drag to position an item, and the three dots icon to Edit, Duplicate or Delete an item.
Categorize the menu: enter a new category name in the text field and click Add.
Click the Add New Item button and edit:
Image (size limit 50MB)
Inside the Payment Methods tab, set the currency. Read about Currency and Payment Methods.